troy_279

Hi all. I've searched and read and searched and read some more. I have an 07 TL and I drive quite easily. Never driving fast and accelerating slowly. The best MPG that I can get is about 26 and thats all highway at 70 MPH. I'm just wondering if there is anything that I should do to try to get better milage. The car has 140k miles and recently has had new spark plugs (HGK iridium) and new OEM air filter. I'm wondering if I should change the upstream O2 sensors? As far as I can tell they've never been changed.
Any thoughts
Thanks

4drviper

well given that the car's rated for 18/26 and you're right on track...

troy_279

I just seen so many people post low 30's when highway travelling thats why i was wondering.

dzionny_dzionassi

i am getting 32mpg on my tl-s on summer hwy driving.

515kbpUA7

how??? i only average 23 in my 07 type s

Paul05TL

So many things affect it, my average is usually anywhere from 19-22mpg in mostly city and some highway.

Yesterday I filled up cleared up my mid and went to SLC (about 30 miles each way, and flat highway) and now I am at 30mpg.....until I do start driving locally and to work then it will go down. Also letting it idle to warm up in the cold season obviously drops it down a bit as the average mph goes down and brings the average mpg down.

took my car to Nevada 2 months ago and that is about a 200+ round trip....my average was 36-38mpg took a bit to climb up.

Coming from a dodge ram that had 3 misfires, gutted cats and a lift on some monster tires......anything over 5mpg is amazing in my book lol. Could not take that thing anywhere.

dzionny_dzionassi

i average 25 on summer and 23 on winter, mixed driving. But hwy is different story, 70mph-80mph will be 30-32mpg for me.

Jackass

If we are talking about pure highway numbers as in you reset the MID when already up to speed and held a consistent speed for at least 50 miles, these are the biggest factors in MPG:

- Tires
--- Going from a low rolling resistance tire to a regular tire can drop your MPG by 3-5 easily
- Air Pressure in tires
--- Low pressure can lower MPG
- Fuel Type (Winter/Summer blends, E10/15, etc.)
--- Usually winter blends lower MPG
--- Usually E10/15 lower MPG
--- Sometimes higher Octane will increase MPG
- Weight
--- The heavier the car is the lower the MPG
- Wind
--- A strong headwind will lower MPG
--- A strong tailwind will increase MPG
- Terrain
--- Obviously going up hill will lower MPG
- Speed
--- For me, driving 45-55 MPH gets me in the mid 30s
--- 65 MPH usually nets low 30's
--- Over 75 and I start dropping in the high and mid 20's

prarce2

I just made the trip from LA to Washington and at 70-75 I was avg about 420-440 a tank between fill ups. That's about 27-28mpg on the highway.

bachimik000

You guys I average around 17mpg and for some I can't get it to be better

4drviper

me too.

i'm really curious how people get 30's going 70-80

ZOMGVTEK

My MID reads about 35-36 traveling at 60 MPH for long enough. I typically see 26-28 on the MID after a tank, and 25-26 at the pump. My MID reads a bit optimistic. 6MT's can see quite substantial efficiency gains over AT's in most circumstances.

For a 6MT, optimal MPG speed is going to be about 35 in 6th. At that speed, with the right conditions, I see 45-(>50) MPG on the MID. Above or below that speed and the MPGs go down somewhat linearly for steady state conditions and reasonable speeds. For a 5AT, about 45 is going to be the best bet.

Cold engines are not very efficient, so frequent short drives with time for the engine to cool between will result in poor MPG. Cold weather dramatically increases the time the engine takes to warm up, and it might not even fully warm up in sub-freezing weather. It's not that uncommon to see <10 MPG on a few mile trip in very cold weather. Trying to group drives together can make a big impact, especially in cold weather. The TL is very sensitive to intake and water temps. If you live in an area where it's commonly 80+, you're probably more worried about the engine bay being too hot. Below about 40 and the engine bay is never hot enough.

How you drive most of the time is going to make the biggest impact over a tank. A few WOT pulls won't really make much of an impact unless you're speeding recklessly and then slamming on the brakes. A block heater can make a dramatic difference in MPG's in cold weather, or even warm.

The pictures you find of MID's showing mid to high 30's are probably under near ideal conditions and don't really reflect how most people use a car. Or they might be over long trips with dramatic altitude loss.

Bruce Banner

iTrader: (2)

I've been eyeballing the mpg more closely on my daily drives. Certainly when I drive more declines the mpg goes up, but driving out on incline progned roads my mpg number dives. So every morning going out my mpg dives 1-2 coming back at the end of the day I gain that 1-2 back

BOSSTLtypes-S

all i ADD to this
---FUEL FILTER
-if your are using various speeds accelerating decelerating....hold a constant speed 65 tops for good mpg, but i would do 60, reset your MPG averaging and see were your at

....since your allready changed out your AIR FILTER..domt meed to do that
---SPARK PLUGS
--- TIRES
-----compression of the motor
----check to make sure the fuel injectors are up to standard as far as performance...(no broke or cracked o-rings, no clogged injectors)

over a period of time your ecu adjust to your driving...i.e. if your drive fast/accelerate fast it will tend to dump more fuel into the cylinders, but if you drive/accelerate slow it will adjust to having to dump less fuel into the cylinders.

that is all i can think of off the top of my head

BOSSTLtypes-S

TEMPERATURE as well...colder it is outside the better for MPG, the hotter it is outside the worst it is for MPG

dzionny_dzionassi

every year, during hot summer weekends i go from Darien,il to Warren dunes,mi. It is about 80 mile drive on flat hwy. I can get 30 mpg easy if i will not exceed 80mph.
Only synthetic oil in trans and engine.
I Always add injector cleaning solution to my gas tank every 5k-8k miles.
Tires inflated to 42psi.
Only premium 93 gasoline (usually shell)
Clean air filter(KN in filter box)