Post actual MPG on your new RDX
 

After 2 weeks, my average is 24

Comfort mode and mostly freeway driving though I am averaging roughly 70-75 on the freeway

Ive onl;y had my SHAWD A-Spec for about 5 days, so its hardly broken in, but getting about 19mpg all-city in Sport and + modes.

I was getting 18 in Sport; now 19-19.6-19.9 in comfort.

I wonder if elevation has anything to do with the variance in mpg...

I started this thread because we're planning to get an Advance Sh-Awd as soon as one becomes available in the color we want in our area. The Sh-Awd seems to be a rarity here (in Texas). Kinda weird since our hill country roads which are heavily populated with wineries and hills (albeit a mini version) are as winding and fun to drive on as those beautiful mountain roads in Central California (grew up there).

It can - but I'm sure the driver and conditions have more impact.

FWIW Alex on Autos averaged 22.5 in their testing - and I'm sure they weren't driving for economy.

Skip to 17:20 in this video:

Actually it can IF you put your foot in to the throttle more than most. I live at the 6,200 ft level. But, with my wife's "foot" she just got 20.1 mpg in town driving. I have no highway miles on it. So, with just over 400 miles
on it, that's not bad. When I drive it, which hasn't been much, I can watch the on board computer for fuel mileage start dropping! LOL! Gee, I wonder if it's my heavy foot? Oh yeah, This thing is quick and fun to drive.
The fuel mileage at 20.1 was figured doing the math, not looking at what the computer says. It's been about .4 lower.

Fuel mileage in town just might equal what our Gen 2's got, which was a consistent 22 mpg. But, the '19 RDX will NOT get the well over 30+ I got with the V6's. It's just the nature of the beast with this 272 hp, turbo 4.
So, fuel mileage average will not be what my V6's got. Always makes me wonder WHY...why Acura did you go to this engine?? Certainly can't claim better economy...although they seem to want to use those words....if
you have been a long time owner of Gen 2 RDX's....and I've had 3, then we know the truth.

I am curious what some are getting who do mainly city driving. I do 95% city driving and have gotten around 15.5 MPG on my 2010 MDX which was rated 16 for the city. I am hoping to get at least 20 MPG on the new RDX.

In comfort mode combining city and highway I am getting around 23

I've been getting 18.5 around town and 25.5 on the highway at 75 mph.
Using 93 octane and Comfort mode in SH-AWD Tech model.
Hopefully there will be some small improvement when the car is fully broken in.

19.6 MPG after 300 miles, 80% city, Comfort mode with a light foot.

Thank you for creating this thread.
This is very useful for those of us considering the RDX....I am looking at the A-SPEC RDX w/SH-AWD
I have about a 100 mile daily commute on mostly highway and would love to at least come close to matching my TL MPG which usually about 26 mpg at each fill up. The official ratings for my 07 TL are 18 city/26 highway/ 21 combined.
I am hopeful that the numbers will improve as the engines break in and the mileages of owners increase.

Advance, 1100 miles, FWD, Comfort mode, 90% highway, Premium fuel

24.3 MPG average as of 7-11-18

I agree with TxLady, it would be nice if people included the fuel type used (87 or 91 or 93) when they specify their fuel economy.
I would also note that I was pleasantly surprised when I was at a local Acura dealership and looking over the new 2019 RDX and popped open the gas filler door and what was inscribed was something like "premium fuel recommended", which to me implies it is safe to use 87, since it also said something like "87 octane minimum".
I wish I took a photo of that wording on the back of the gas filler door; if someone has a photo, perhaps they can share it with all of us. Thanks.

Sure you can use 87, but the ECU will mostly likely compensate and you can possible lose some hp/tq and get worse fuel economy then if you used 91.

There was a thread (in the many 2019 RDX threads now active) which had a very lengthy discussion on this topic. (I can't recall which thread it was.) It seems many felt the turbos could be impacted in a negative way by long term use of the lower octane fuel. The higher octane would provide a higher mpg, better performance; and, longevity without issues. I'm no mechanic (by a long shot!) But a couple of the contributors said they had experience with turbos and were pretty adamant about their feelings on the topic.

Just mentioning this so if you want to do a search on the forum for the conversation...it might answer some of your questions.

Yes, turbo engines "push the max fuel and air into the cylinders to maximize HP on these smaller engines. Even the manual tells you that when using lower octane fuel, you "could experience engine knock" from time to time....and IF prolonged can cause long term damage to your engine. I used
to teach internal combustion engines, turbine engines, and diesels.....turbo types too.

The problem is enhanced during much hotter operating climates and when towing. So, I've always used Premium fuel.....in my Gen 2 RDX's...personal choice there....and I will always use Premium in my '19 RDX. Just a smarter move with this engine.
I know I will get push back from some....but, what I stated is just the facts....and even though Acura wrote the same "warning" with the 3.5 V6's......it's even more imperative to use Premium with these turbo 4's.

If you use 87 octane, then you will just have to "baby your driving technique" a lot more. But, again, in really hot weather and or towing, you better be using 91. JMPO.....FWIW

Jeez, if yalls are getting around 20 mpg in comfort mode, a guy like me, who really only drives in Sport and likes to make the drive an adventure, is probably only going to get 16-18 mpg using 91 going about 80 mph on the freeways, 60 mph locally. Hmm..

I drive in Comfort mode at 75-80mph on the freeways

Advance AWD, 75% city/25% highway
21 MPG, premium fuel, 1500 miles

I'm lucky to have a friend who is an expert engineer in energy-related industries, now retired, but remains a consultant for major energy/transportation companies.
His advice:
Use premium synthetic oil. He uses Mobil One (0-20 unless recommended otherwise) in most of his cars.
Use "Top Tier" fuel, especially if using regular grades. Top tier mostly impacts 87-89 levels where some companies restrict additives to premium (91+) grades.
Use the recommended fuel...if manufacturer recommends premium, use premium. Efficiency (mileage and power) will be adversely impacted by lower grade fuel. Using regular might save money, depending upon pricing premium.
There is no significant benefit using higher than recommended octane levels, as long as it's a top tier fuel.
Avoid ethanol. The most common (10% blend) will reduce efficiency (mileage/power) 3-6%, depending upon application. Unfortunately there usually is a slight cost premium even considering the efficiency advantage.
(My friend's cars total about $1.2 million, so not much concern for him)
Ethanol blended fuels also have been the source of significant problems when used in older automobile engines, as well as most small "garden tool" motors (weed hackers, chain saws, etc.).
Note:
Ethanol free fuel availability can be found on "puregas.org" website...availability is becoming extensive in most states. Unfortunately states owned by the corn/ethanol lobby (i.e. Iowa, Illinois, California) have succeeded in restricting choice/availability.
Ethanol began being sold as an environmental solution, long since debunked. Not even Al Gore continues to support ethanol. Now it's just a tax-fed money machine for the corn/ethanol industry and there related political contributions. IMHO.

"There is no significant benefit using higher than recommended octane levels, as long as it's a top tier fuel."

The only thing I would add to that is in the case of the 2.0 4 cylinder turbo, Honda recommends 87 in the accord and 91 in the RDX. Dyno tests on the accord showed a slight boost in the power when using premium fuel vs 87. I'm thinking Acura just used premium fuel in their tests to be able to claim the higher power numbers and it's just about the same engine, so higher octane actually gets your Honda the Acura numbers.

This is the actual website:
https://www.pure-gas.org

Ethanol free fuel availability can be found on "puregas.org" website...availability is becoming extensive in most states. Unfortunately states owned by the corn/ethanol lobby (i.e. Iowa, Illinois, California) have succeeded in restricting choice/availability.
Ethanol began being sold as an environmental solution, long since debunked. Not even Al Gore continues to support ethanol. Now it's just a tax-fed money machine for the corn/ethanol industry and there related political contributions. IMHO.

__________________________________________________ ________
How much is this ethanol free gas ? It looks like all racing fuel in my area ( MA)

Same around here locally - it's either at a marina (tough to pull your car up to the pump) or 100+ octane ($$$$).

Most stations offer either E0 (Ethanol free) OR 10% blend on their premium (91 or 93 octane) gas. Filled up this week at $2.99 91 E0. The blend available at another brand at $2.89....so E0 was (here) an additional $0.10/gal. I live in relatively low-priced market. About 30-35% of the stations around me have converted to E0 on their premium, but keep 10% on their 87-89 octane. Note that marine and aviation fuel does not allow ethanol...

I haven't researched the complete specs of the RDX engine, but I suspect there will be upgrades to the RDX as there were in the Honda Civic type R (306 hp, 295 torque). The type R gets substantial internal hardware modifications as well as higher flow fuel injectors, higher flow turbo, more aggressive tune, etc. at same 9.8 compression ratio.
Note I said "any significant" increase using higher than recommended octane rating. There could be very marginal increase as the timing approaches maximum allowed. Nothing to justify the price premium.
Using premium in the Accord motor will not result in a 20hp increase.

Heh come to California. E10 everywhere.. *crycry*

I'm no mechanic either but after reviewing multiple reports from consumerreports and fuel.gov or whatnot. 87 might slightly affect performance and EPA but is considered neglible compared to the price you pay for premium. There is also NO reports of long term reliability as it does NOT damage the engine(government website). When asked Luxury automakers, they have also stated that premium MAY Dec performance and EPA but have never claimed that there will be any damages. This is all for cars where premium gas is RECOMMENDED and not REQUIRED. I believe it is also true that there are sensors that let's the ECU know what octane gas you are using for modern cars that calibrate accordingly, and I would be very surprised if the 2019 RDX doesn't have it. I do believe that luxury automakers who recommended premium say so, so that the driver gets the best experience possible with that car. The engine and turbo is derived from the type R and accord. I don't know how different the engine is from the accord but the accord is recommended for Octane 87. So people who are claiming it will damage these new turbos think again. Cars and the entire gasoline automotive industry have been around for a while and know what they're doing. If they really thought you NEEDED premium fuel they would make sure to let you know of it.

The times I would definitely use premium just to be sure is summer, towing, any sort of knocking. (You will know early on, a couple knocks won't damage the engine)

Now why am I stating all of this? Because I'm the type of guy who will pay 50k for a brand new 2019 car but refuse to pay the extra for premium fuel if I don't have to.

As a follow up to this...

My RDX now has about 1000miles (1600kms) on it and the last tank showed 23mpg (10.3L/100kms), same driving situation, mostly city and rural low speed highways, Sport and Sport +, 91 gas. So in my case, fuel economy is getting better. Wife is doing a few longer highway commutes this weekend, so I'll be sure to report back in a few days.

My mileage is averaging 21.3 MPG which up form 19 MPG.