07grabber4.0

I don't know why I am getting 14.7 mpg. I don't have a bad lead foot and I don't gun it off lights. It's mostly highway miles also. What could be making me get such bad gas mileage?

kevinmalec

low tire pressure, dirty fuel filter, dirty air filter?

2005Redfire6

+1


Also what is telling you that you are getting gas mileage like that? If its the on-board computer I wouldn't pay much attention to that because they are off often... I would calculate it by hand first. Run it from E to F and divide the mileage by 14.

07grabber4.0

I checked them and the filters are fine. And I just put air in my tires so it can't be the preasure

07grabber4.0

Yah I'm doing that next refill just to check

xomustangchick

hahahahahaha liarrr! you gun it every where to hear your exhaust babe!! mwhahaha love you

Nuke

Hand calculating requires 2 accurate pieces of data: distance driven between fill-ups and amount of fuel used between fill-ups. Check your odometer and speedometer against a GPS to make sure they're reading accurately. Gear changes and tires size changes that change what the PCM thinks you have can greatly skew the onboard data (which isn't very accurate on the vast majority of S197's to begin with). Once you hand calculate after a few fill-ups and have a few good data points, then you can begin assessing what's going on.

Check your tire pressure every other day until you're POSITIVE that there's little variance going on (tire pressure will change roughly 1 PSI for every 10 degree F change in tire temperature).

Engine performance can affect fuel mileage greatly. Bad plugs, fouled injectors, plugged catalytic converter... many possibilities.

Ihateyourface

When I bought my 2007 V6 the read-out said it was getting 14.2 MPG. The guy I bought it from lived in the city of Chicago where traffic is just awful. When I got it back to to the burbs where there's significantly less traffic it eventually went up to 19.0. It could be possible that if you're blasting the air conditioning and not doing much highway driving that there's nothing wrong with the car and you're just getting crap mileage. Although judging from your picture you don't live in an urban area lol.

kput

I get 15 city.
I check it every time I fill up as well. Miles drivin/gas used.

That's with slight traffic. Constantly gunning it from lights, WOT quite often as well. Occasional street race thrown in there..
Also with 40lb rims (per corner). and 93 octane fuel/race tune.

Strangely, my mileage didn't change at all when I put on my snow tires (OEM 26lb rims..).

Driving like a granny nets me about 16mpgs.

I've just stopped caring. Gotta have gas. gotta drive. might as well enjoy it and not worry about the mpgs.

07grabber4.0

I agree with you I don't really care I was just curious why my MPG drops so much.