mav238

That sounds right. On better traffic days, I get about 12.1 L/100 km for 90% city driving and 10% hwy driving, combined. But on average , it would be about 12.5 L per 100 km. And plus, I live up on a 3000 ft high mountain community, so lots of daily mountain climbing with the RDX. So I would say that the 12.5L per 100 km is as expected (given the weight and full-time AWD).

cyrusthegreat

how many kilometers do you have on your car?

mav238

19,000 kms and with 3 oil changes already (DIY).

njacuraowner

I travel 85miles round trip to/from work every weekday on Route 78. Most of the time on the highway I am doing 75-80mph. I live on a mountain and just the mile or two climbing to my house seems to impact milage. I average 20-21mpg. If I slow it down to 65mph the mpg can be 24.

mav238

Not meaning to be facetious, but does NJ really have mountains? By mountains, I usualy think of them being at least 3000 ft up in elevation...

Over here in the northwest, British Columbia, it is commonplace to find communities on mountain tops, as the Rockies run through there...

njacuraowner

Funny - I was going to add that too. You are correct you can hardly refer to anything in NJ as a mountain although I am at one of the higher points. Still it's only 950 feet. It does kill the fuel economy as I climb.

ehab_marcos

i used to get horrible results 15.2 L/100km (15.4 mpg). But now my RDX is about 5,500 km (3,417 m) and i am averaging 11.7 L/100km (20.10 mpg) mostly on city driving ... not bad.

MMike1981

ya...i dunno, my 07 had around 7k miles still got the same mpg as day 1, not too optimistic, but i also dont care that much at the same time, is what it is. my avg speed, at least on the comp, usually stays under 20 for most tanks. i may get on a highway 1, 2x's a week.

mav238

Currently, I try to choose a good time to go to work when possible, less traffic... monitor my speed and lead foot... currently getting around 11.8 L per 100 km... But if I start driving it around my local town area, getting groceries etc... it will jump to 13L per 100 km...

scutts

I've had my RDX for 19 months now and it has about 17,500 miles. I generally average just over 20 mpg (20.2, 20.4, etc.) in mixed city and highway (including rush hour stop and go) driving. The highest gas mileage I've gotten on a long highway trip was 24 mpg (no big mountains to climb and a speed limit of 55-65 mph). The lowest mileage I've ever gotten over a full tank of gas was 19 mpg. I'm not impressed by the gas mileage of this vehicle, but (1) I knew what I was getting into when I bought it, and (2) the car is so much fun to drive that I don't mind too much. I compromise by riding the bus to work 1 or 2 days a week.

john50

It's just a matter of relativity. With my Jaguar XJR, when I mash the long skinny pedal, the instantaneous mpg goes to 0 and stays there. But it is fun.

MMike1981

if ur not impressed, you should be with those numbers..the lowest to a tank was 19? thats pretty damn good, all considering.

XLR8R

Over a year now -- consistantly 20.0 mpg.

I think that average is pretty darn good, considering it is close to many family sedans (Impala/Aura, Fusion/Milan, Galant, Mazda 6, Taurus/Sable).

All highway, the RDX gets 25 to 27 mpg, depending on terrain.

The little turbo 4-banger puts out the power of a large V6 (3.5 to 4.0 liters) with the fuel economy of a small V6 (2.7 to 3.3 liters). I suppose that doesn't make a very good marketing slogan though.

portwashguy

25-27 mpg highway? Just this weekend I did about 360 miles of smooth freeway driving at between 65-75 mph yet only averaged 22 mpg. I can't imagine what could account for the difference.

bialkoni

I have to agree, the best I have ever done was 395 miles all freeway on vacation after filling up averaged 23.8 mpg on that tank. I used cruise control and took it easy between 65-70mph. I do not know how anyone gets 27-28mpg.

XLR8R

Speed....speed = rpm = fuel burn. (Other factors: terrain, or loading, or tire pressure.)

I drove 530 miles across PA and back, (through the Allegheny Mtns) and got 25.2 mpg, but my speed was between 50 and 65 mph. We had 3 people (about 480 lbs) and 100 lbs luggage.

On the flat DelMarVa penisula, with the same load, my speed was about 50 to 60 and I got 27 even. In both cases my average speed was probably 58 to 60.

Power and drag increases exponentially to the velocity increase -- there is a large difference between 60 and 75 mph.

Note that portwashguy was up against 75 mph and got 22 mpg, bailkoni dropped it to 70 and saw 23.8, my upper limit was 65 and I got 25 or better.

The RDX -- like many cars -- is most time/fuel efficient between 45 and 55 mph, if one can tolerate going that slow.

cwepruk

I get 23 mpg on fairly flat highway driving with the cruise set at 75 mph.

My city mileage is much better at 18-19. I'm getting 18 right now with a decent bit of aggresive driving. With gas prices where they are, I'm glad I didn't get an SRT-8.

portwashguy

25-27 mpg highway. Hmm. On my trip there wer just 2 occupants with a combined weight of 330 lbs. No cargo/luggage. No significant terrain. Tires inflated perfectly. I wonder if we are using a different method of calculation. I based my info on the MID. Did you manually calculate the MPG?

MMike1981

27mpg.....i dunno man, lol im not doubting what you see or think, but im begiing to think if you guys make claims like this, i want pics of the MID along with it showing mileage avg speed and all that stuff. i dont buy the 27, if u got it great, i just dont buy it.

XLR8R

I just use the MID these days. I used to calculate when the RDX was new -- and like most -- my MID reads about 1/2 to 3/4 mpg high. It measures fuel injector dwell time. I do simple math -- with 10 days and varying temps (fuel density) at refuel. Whatever.....it's close enough.

The trips were last summer, I didn't bother with photographic evidence as the mpg didn't strike me as unusual, and I don't think there is a prize involved.

Note what cwepruk writes:

Reduce that speed to 65, the rpm will decrease and the economy should go up... to about 25. Reduce further to something around 55 to 60 mph, the rpm will decrease again, with a resultant increase in economy to well....about 27.

mav238

Actually from my experience, my MID tells me when I am cruising at 55 mph, the gas mileage is ~ 9L per 100 km, that is about 27 mpg (US). Now, that is if the freeway is flat (no incline to climb) and little to no headwind. I did this, by resetting the MID while cruising at 55mph.

Once you start introducing some terrain changes, the fuel economy will adjust. With city driving at 90% of the time, I am getting ~ 12 L per 100km.

MMike1981

ive driven to my summer house many times, bout 1hr 15 mins in my car alone, with a gym bag.....i cant break the car over 23. its impossible. ive done it going 55, 65 etc. stayed off the boost and rpms as low as possible. i did this a few times until i gave up completely. flat highway, 4 lanes wide, easy cruising.

i guess i should rephrase what i dont buy: i dont think i doubt u may see 27mpg. i think you could be one of the only posters on the board making that claim. I also think that going 55 on a highway is dangerous, you are a slow moving vehicle that poses a threat to faster moving traffic ( im not trying to start a debate here about speeding etc) but a guy going 55 at least around where i live, u may not be in an accident but you can create an accident...in my office i have files of people getting citations for traveling too slow, resulting in an accident...im just saying.....

anyways....a regular travel speed for me is 65+ on the highway...in which, 23mpg is the highest i could possibly get. now i know every single person is different, and location etc, but 27mpg boggles my mind, especially with your claim of people in the car and luggage etc.

i just cant see it, and given how many people have posted their mpg here, u remain quite the top hash mark for mpg in this truck. my gf's TSX has trouble getting 27mpg on premium.

MMike1981

if you reset the comp on the highway, of course it wil lstart dramatically high, how long does that average remain constant? when my comp resets when i get gas in the city, my avg is around 10, but thats not my true city avg

portwashguy

One final comment: 55 is crawling, not cruising

mav238

You are correct... but let's put it this way... can you find a road that is really flat and has no small inclines whatsoever? If you did, and you leave your car on cruise control @ 55mph, you will find the MID read out to stay constant @ 27 mpg. But that is under totally ideal conditions...

Under real driving conditions, I have been getting around 25 mpg on a free-flowing freeway @ 60 mph, and 20 mpg with mostly city driving.

cwepruk

I've cruised at 65 and I get about 24 instead of 23. On a divided highway, 75 is the norm. I get about 19 mpg city in my Maxima, but 28 highway. Usually the highway/city gap is better.

That being said, my 350hp Forester was about 23 mpg as well at 75 mpg, but that was at 3300 rpm's with 740CC injectors.

XLR8R

I'm no hyper-miler. The speeds I'm quoting was moving with traffic. The PA Turnpike has numerous 55 zones and construction zones -- and the DelMarVa penisula -- well, have you ever driven to the Delaware shore in June?

Just the last couple of posts have indicated economies at 70-75 mph that, if you interpolate down to 55-60, will result in 25+ mpg. Mav has seen it himself, and yes, on a flat road (like DelMarVa) a reset MID will quickly stabilize to an accurate number (at steady speed).

I am not advocating hyper-mileing and blocking traffic. I am only saying that the RDX will achieve 25-27 mpg at lower speed. it's simple physics. When I drive 75 mph, I get 22 mpg also.

MMike1981

ok so at least its safe to say, in RARE occasions, its possible to get 25+....in MOST occasions i would call 22-24 the norm for highway driving (moving with steady traffic, 65mph etc n so forth).......agreeable? i think putting high range numbers in this thread reeally throws the balance off, especially to a new owner wondering why his/her mpg is low (even tho its on the window sticker!) heheheeh

beachbumbob

I can't drive 55! [or even 65 for that matter] :-)

Stop the insanity!! This vehicle was meant to be driven hard & fast... turbo, paddle-shifters, SH-AWD, come on people...

scudzuki

I routinely get 16 and the best I've seen is 17 (calculated at the pump, all suburban driving in relatively un-flat SE PA). The computer reported 17.7 when I got 17 and that seems like the standard "Honda optimism correction factor". For anybody who is posting, please don't make any claims based on what the computer reports. Do the math.

Joe

phoward_15

So I finally got my MPG to 20+MPG. I did a road trip this past weekend from Boston to Wallingford, CT and got decent gas mileage. I was pleased at getting 21 MPG because I'm sure some of that included a little Boston driving before the long road trip. So I feel as though I could have gotten up to 22 if I traveled a little longer. I'm happy with that. Oh BTW it said my average speed was 53mph.

I'm starting to see a consistent average of about 17.X from all my city driving now. I have about 1,500 miles on the car so I can actually see it breaking in the more I drive it.

I love this car. The longish drive (only about 2 hours) was really comfortable and safe.

bialkoni

Just got back from a trip, I averaged 25.2 mpg from Atlanta to northern NJ. drove about 50/50 with cruise and without. Never had this high of an avergae before. Drove about the same as always. Could there be a difference between the Winter and Summer blends of gas. Just wondering

MINIFVR

I get about 19-20 mpg. Not too good really...

acurardx

I just finished a 2000 KMs trip, 85% highway, with AC on, and lot of uphill (even on highway --> used the Turbo a lot)

Average mileage for the trip 10 litres per 100 KMs shown on the dashboard. (It even started with 9.2 in the beginning until I started using the A/C and Turbo for uphill)


Note: 44K KMs since Sept 2006, average 10.8 L/100KMs. Not excellent but I am ok with it. I don't see much difference in gas mileage as comparing to my old CRV. But of course, RDX is using premium gas, but CRV also didn't have enough horsepower at all..........

ADAMnQuickRDX

With the rising gas prices i've started driving granny style and am now getting 23 to 25 mpg with a mix of 60% highway 40% city driving. The key is to stay out of boost completely and not go over 65mph on the highway. It's tough but it pays off. I went from getting 260 to 280 miles per tank to 360 - 370 miles per tank.

XLR8R

Yep, sure is. Winter blend contains about 10% ethanol which reduces economy. About May they remove the ethanol for summer blend, and everyone's economy should go up.

happywithmyrdx

Guys,

As I'm sure several posted, there are lots of conditions that can make a difference. I tend to be a pretty gently driver most of the time, and I normally average 22-24 MPG combined city/highway. As the gas prices have gone up, I've been using more of the mypermiling tricks, and they are remarkable if adhered to, and I skip the less kind-to-your-fellow-drivers [like driving tooo slow] techniques, although I know they work from trying them at various times.

So, to give some idea of improvements, I'm now averaging 27.5 miles to the gallon with a 50/50 mix of city/highway. My last tankful was 28.5, as I have gotten a little better at finding the 'sweet spot' speeds of driving the car.

All the techniques were from reading places like cleanmpg.com and such.

One:
Driving slower - I've been driving between 55-60 most of the time. This means that I've been using secondary roads vs highway, where the speeds are posted at 50-55, so I've not been a detriment to traffic.

Two:
Tire pressure - After reading posts by drivers who have been doing this for quite a while, I increased the tire pressure to 40psi. Yes, the ride is a little bit harsher, but I picked up 2 MPH from this alone.

Three:
Slow takoffs - Now, when shooting out into traffic, I just push down the pedal, I don't want an accident. But, for example, when coming out of a parking space, I just kinda coast out. I also learned that you park at the highest point in a parking lot, so you can coast out of the space when you start, which uses less gas. When coming in to park in a parking lot, I just coast as much as possible.

Also, if there is a lot of traffic, or no one behind me, I take off very slowly, probably twice as slow as normal. This picked me up another 1-2 MPG.

And, just to give some comparisons, I was on a highway trip recently, and was talking with a trucker who let me draft behind him. I averaged 36MPG for 100 miles. To get that required being about 40-50 feet behind the truck, which is a little close, but not like 10 feet behind it.

Anyway, just wanted to throw my 2 cents in, it's certainly helping to pick up an extra 60-80 miles per tankful right now.

karrock

I've been lighter on my driving foot lately, what with the price of gas climbing into the stratosphere...

As simple as keeping an eye on the turbo gauge to keep the needle from climbing (which we all know drinks gas like a monster) and watching speed along with the trip computer helps me regulate gas mileage very well. Much of a hint of uphill grade and the first thing the cruise does is kick in more thirsty turbo. Cruise control works best on level ground (or downhill, natch), so I've found that I can do better than the car can at preventing turbo usage.

My last 260 mile stretch before fill-up yielded me 27.5 mpg on the computer (not a full tank of usage, mind you -- I wanted to fill up before an extended trip) and I'm currently operating a tank that has 350+ miles on the tripmeter and an average of 24.8 mpg. Mostly highway, but a fair amount of slogging through stop and go city and nasty traffic.

Not hypermiling by a longshot, but I don't induce the turbo unless I really need it and I've been running 0-10 over the speed limit. I believe average speed on the computer says 52 mph right now, but it was over 60 before the last leg of a long drive.

phoward_15

Karrock - what kind of mileage do you have on your car? I'm only at 2,000 as I got it in April so I'm averaging about 18 MPG both city and highway right now. Just curious if your car is just broken in a little more than mine.

The turbo gauge does do a good job of letting you know if you're wasting gas. I look at it all the time, especially when on a highway.

portwashguy

What is your definition of city? For point of reference, mine is midtown Manhattan, which is endlessly gridlocked.