CubanGuy

Hi,

I have a 2007 TL Type S and it has 66k miles and is an automatic. I purchased it about 2 months ago and never paid attention to gas mileage until recently. I only get about 175 miles for an entire tank of gas!!!! Horrible! I should get getting closer to 300 for an entire tank (20 average mixed hwy/city with a 15 gallon tank). Something is seriously wrong here.

I love this car a lot but the 175 miles total for one tank of gas is 12mpg mixed hwy/city. Really?

When I bought the car I had it inspected at the Acura dealership and everything came up good except timing belt which I an on changing soon. I then took it to my local mechanic and they couldn't find anything wrong (no fuel leaks, etc.). I even changed the oil.

One thing I will add is the car came with an aftermarket cold air intake. Would that seriously take the gas mileage down from 300 to 175 per tank? I though air intakes would increase gas mileage!

Has anyone experienced this on their 07-08 TL Type S and if so what did you did to get it back to a 300 mile range????

hisost

iTrader: (2)

I think your EGR Valve is clogged. Maybe someone with more experience in the garage could chime in

Turbonut

iTrader: (1)

Well, 175 miles on an "entire" tank really isn't a way to check fuel mileage as the light will come on @ 14 gal. Fill it up and divide the mileage driven by the amount of fuel needed to fill the tank.

17mpg city/26 mpg highway-ballpark range
Drive like a maniac and the numbers will drop drastically

YeuEmMaiMai

If you drive like a normal person you could see 21 city and 30+ highway

top thing you can do to instantly improve your gas mileage

1. KEEP OUT OF THE TROTTLE

I drive an 02 CLS and I see 20+ in the city how you ask? keep the rpms under 2K. Around town there really is no need to push the car above that

Other things you can do that will net you a noticeable increase

1. when you see a light turn red, let off the throttle and let the car coast. anything above 1200rpm = no fuel to injectors
2. keep your tires inflated to the right pressure
3. take all the crap out of your car.
4. when driving long distances, use the cruise control

justnspace

iTrader: (1)

this fool said: i never paid attention to it.

have you reset the trip info?
have you calculated by hand?
we need a lot more info from you in order to draw a conclusion.

1 trip of 175miles doesnt tell us much.

ZOMGVTEK

The car is most likely totally fine. It's how you're driving or the conditions you're driving in.

I regularly see single digit MPG's in my 6MT TL-S when its really cold, in the ~0ºF range. This is the same car that typically gets ~34 in 'city' driving the same route when its warmer outside. However, I use a block heater year round, which helps quite a bit. In ideal conditions ~50MPG is possible, but rather impractical. With an auto the best you can do with the engine on all the time is probably limited closer to 40.

At least on my manual TL, hard acceleration never really appeared to make a big impact on fuel economy. However I don't accelerate hard only to stop at a red light, or hit the brakes. Plus I ride fuel cut, a lot. The auto likely dramatically limits your opportunity for fuel cut in city driving.

NBP04TL4ME

There are a ton of variables to be considered that make understanding / diagnosing your mileage woes nearly impossible.
FWIW - I have an 08 TL Type S 6 Speed and regularly get 24 - 26 MPG on mostly back roads (30-40 MPH). Allong with that mileage I get 400 miles to a tank.

polobunny

Heck I do similar with a '04 AT TL at 62mph on the rightmost lane...
Smooth acceleration, cruise control on when no hills, no unnecessary braking, let the car coast to red lights.
Put it in manual mode and pretty much go 1-2-3-4-5 ASAP all without accelerating fast.
On the AT you can jam it in 5th at 38mph.

But then it's an absolute snooze.
Did that for 1 tank before almost wanting to throw myself in the ditch in search for excitement, now I approximate 300 miles a tank with just a bit of WOT every now and then... it's just safer for my mental health.

NBP04TL4ME

I got better mileage in my 04 TL 6 Sp, but nowhere did i say I didn't have fun!

There is a reason I haven't owned an automatic since '93.

polobunny

If I could I would have got a MT TL, but they're too rare and this AT one was just too good. The shiftgate and the manual mode on the TL is nice enough, so it's alright. I have a feeling I'm going to have the itch next summer though, so who knows...

Definitely no fun to be had coasting everywhere. It works, but no car was meant to be driven that way except maybe a Prius.

NBP04TL4ME

I had to order my 04 6 Speed and it took 3 months to be delivered. I guess I got lucky finding my 08 TL Type S 6 Speed. I found it at a dealer and purchased it as a CPO with 13K on the odometer.

CubanGuy

Thanks everyone for your feedback!

Yes, I never really paid a lot attention to the MPG as I was mainly driving around town but have recently been driving in the HWY about 35-40 miles one way and when I got home my odometer was close to half a tank. So I just started wondering what could be wrong.

On thing I recently did was put Premium fuel. For the past 2 months I have been putting 89 - middle grade as I heard it would be ok. So maybe that could be part of the issue. I also just got an oil/filter change. I had checked the oil and it was pretty low, so that could have been another issue.

I just filled it up the other day with Premium and have exactly 80 miles (I reset the trip computer) and the dial is a few tick marks before half way point.

No engine lights or any warning lights have turned on. My local mechanic said everything looks fine but I didn't have him check the EGR Valve. I also have a cold air intake (need to find out the brand). I heard if it isn't installed properly that it could cause gas mileage to suffer. So I am thinking of taking it to a performance shop to see. Would it be worth me buying the original OEM intake and installing it? If so, how many more MPGs would you get?

The air pressure in the tires are good. 35 front and 32 rear.

There is nothing heavy in the car either.

And yes, I love to floor the car every so often. Who wouldn't?!

When I drive on the highway I go around 75-80 and maintain the speed. I don't use cruise control.

My trip computer says <17 at 26mpg average (or close to that).

I will see if the premium fuel helps and what my final total mileage is for this recent tank of gas in the next week. I will wait until the fuel warning light turns on. I might actually get close to 210 total, but that is still short of the average 300-350 that most other 07-08 TL-S automatic owners are getting.

If I could even get 275 total per tank I would be happy!

Thanks again!

polobunny

Whoa whoa whoa slow down there. 91 is what goes in it. Less than this you'll affect your gas mileage. You don't win putting lower grade in a car that stipulates in the manual you should put 91 grade.

40 miles on the highway doing your speed shouldn't touch much of the tank really. Unless you have it always in 3rd gear or something.

Second thing, oil change is good. But your oil was low? Oil should NEVER be low. Honda jokes apart, properly functioning cars don't burn oil.

Don't bother with the OEM intake. Should fare very similar, even performance wise... That's for a different conversation though.

Nothing wrong about that.

I'm not sure I understand you. If you reset your trip computer, it tells you 26mpg at the end of your tank?

I agree that 210 miles is awfully low unless you like to make the tires squeal at every red light and corner.

CubanGuy

Ok thanks again everyone!

Sorry I meant 17mpg at 26 miles per hour

polobunny

You mind resetting the trip computer while you're on the highway for your 40 miles then checking how many mpg it tells you at the end of it?
If you got cruise control and you put it on doing 75 mph I'd love to see if it's anything less than 20. It shouldn't, like at all.

Besides, do you smell any gas smell from your car? Leaky gas tank could be a stupid issue. If you rule out your driving habit and the gas leak, then next would be improper air/fuel or mechanical issue regarding the burning off these precious gallons of dinosaur juice.

NBP04TL4ME

Not that it would make your MPG drop THAT much but when last was the engine air filter changed??

CubanGuy

Nope don't smell any gas leaks and my mechanic said the air filter looked fine.

I will try the trip computer on my 40 mpg trip sometime this week.

pohljm

Another mpg thread without avg mph. Useless

NBP04TL4ME

^^^^ excellent point by you.

polobunny

Actually, there is. 26mph avg, and he usually does 75-80mph on the highway.

NBP04TL4ME

Assuming that is correct, he has to be spending a lot of time crawling......

polobunny

Hey I ain't judging if he likes to roll down his street to show his new ride. Don't disagree though, some calculations seem odd if he's got 40 miles to go at 75mph.

My daily commute to work lasts exactly 10 minutes and is 1.8 miles on slow city roads. If I don't do anything but work for 5 days straight, I get terrible mpg and under 20 mph with all the stop signs and lights. Eventually I'll end up having to explain to the popo I was speeding to keep my battery in good shape.

CubanGuy

I do spend most of my time driving in town vs. on the highway, which probably explains the 26mph average with around 17mpg. I should look at the trip computer after driving on the highway for 40 miles and I bet it will be higher.

BTW - I am starting to think it has a lot to do with not putting premium fuel. I will know more once the tank is almost empty.

There is a reason why it says Premium only! Lol. It's costing me a whole lot more to fill up at gas tank in the end when I tried to save maybe 20 cents a gallon. That was stupid!

polobunny

It's a common mistake. In the end you end up spending pretty much the same amount but with reduced performance & mileage when you opt for the lower octane fuel when your car manual specifies a higher octane fuel.

truonghthe

I start to reading this thread until "I put 89 in the TL" that where I stop reading the rest.

Chad05TL

svtmedic

horseshoez

iTrader: (2)

Seven miles isn't much of a test; fill up at Tom's Place, reset the computer, drive to the outskirts of Bishop; take a picture of the Trip Computer screen; 24 miles, 92 mpg, average speed 70.

Said another way, try getting 40 mpg on a full tank; I'm not going to hold my breath.

thoiboi

justnspace

iTrader: (1)

try holding 40MPG for longer than 7 minutes....you can't do it.

thoiboi

I could probably do it coasting down a mountain and not pressing the gas at all

justnspace

iTrader: (1)

gawyammit, Texas is flat.

MyGuti

I average 8 Litres/100km on my 6mt Type-S, which is roughly 30miles per gallon

horseshoez

iTrader: (2)

That was the point of my post; I once rode my bicycle from Tom's Place down US 395 to Bishop and made the trip in about 22 minutes. On the way back up it took nearly two hours.

ppeter78

Hey guys I to have horrible gas mileage on my car. I have a 2007 Acura TL s type it's an automatic I always use premium gas and I only have 17000 miles on my car. It's properly maintained I always go to the dealer for everything I always keep my tire pressure proper but the best gas mileage I get in the city is between 10 and 13 miles per gallon. On the freeway if I go between 65 and 70 miles per hour I can get 25 to 26 mpg. If I speed the gas mileage drops significantly.

Any suggestions? It was just at the dealer and they said they have no clue why it's doing that...
I drive my car like an old lady. I coast to red lights I accelerate slowly I don't know what else I can do. I do live in South Florida where it's hot and muggy 95% of the time the past that I don't know what else could contribute to it.

So far the only maintenance I've had done to my car is oil changes I replaced the two front tires and I had that power steering recall fixed my Bluetooth broke on my car several times so did The back-up camera and of course I replaced the air filter and the in cabin air filter.

Chad05TL

Disconnect the battery, change the transmission fluid by doing a 3 quart fluid drain and fill, 2 or 3 times....(wait a week or so between each drain and fill)
Any possibly change the 3rd and 4th "clutch transmission fluid pressure switches"..
reconnect battery,
go get on the highway and give it some throttle.

As far as type of Fluid, Ifor each drain and full it takes 3 quarts each time, I would use 2 quarts of Redline D4 mixed with 1 quart of Redline racing fluid.
So that 3 times and that should be ok.
If you drain and fill more than 3 times, then I would use 3 quarts of D4 and skip the racing fluid. The system holds 9 quarts, and drain and fill only blends in 3 quarts at a time. So it takes several drain and fill procedures to blend in new fluid.. but it is the safest way to do it. So, after 3 drain and fills, I would lean back to 100% D4. No I would not use the Honda/Acura Fluid.

This fluid change will help your Torque converter to lock up and not slip as much.. Which will get you better gas mileage. but you need to blend out some of that Honda fluid.

Disconnecting the battery will help it relearn. reboots everything. Make sure you have your radio codes. there are 2..
Make sure your battery is Ok too. Like, no dim lights.. and no hard starting..
Verify no check engine lights. (the obvious stuff of course)

And as I said, after all that, drive it on the highway and goose it some..

Chad05TL

This specific location was 7 miles south of Bush and 75 on 75, heading north. Ending at Bush and 75

horseshoez

iTrader: (2)

Your fuel economy doesn't sound terribly out of line. Your fuel economy in the city might be high or low depending upon how much traffic you drive in and how much time you spend idling going nowhere. Your highway mileage might be a tad low as I would expect automatic models to get 28-30 mpg.

If you've had the codes read with no results you can try replacing the upstream O2 sensors as they sometimes get lazy, not lazy enough to throw a code, but still lazy enough to negatively impact fuel economy. If you opt to replace them, use either OEM O2 sensors, or buy Denso sensors; whatever you do, under no circumstances buy a Bosch sensor.

DMZ

I still wanna know why Acura couldn't put an INSTANEOUS MPG gauge in our cars instead of that dumb average for the tank fill. That would help everyone drive efficiently, but that would have required too much brainpower on their part. Just like the missing turn signal mirrors on the '04/5/6 TL's while the models above and below (TSX and the RL) had them. The first 3,000 3G TL's produced had turn signal mirrors on the window sticker. Meanwhile, the 0'3/4/5 Accord came with an instantaneous MPG included with the Nav system.

As Acura owners, we have every right to expect more, NOT LESS!
.
...
Acura
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.

Chad05TL

Her car has very low miles. Even on an 80s iroc, old school, o2 sensors didn't go bad that fast. And its uncommon for them to go bad on a honda. I wouldn't change them unless there is a code stored. The check engine light would have come on for engine related issues. (Not body related issues) hence, check engine.