Hello,

I'm usually around this forum a lot, as I love TLs, but sadly don't own one, yet(its a work in progress). But anyways, I own a 2003 Hyundai Santa Fe, 4cyl base and recently my mpg is just terrible. I don't get more than 100 miles to the tank.

According to fueleconomy.gov, I'm meant to get: 18 City 25 Highway; with a Tank size 17.20 gallons, which means I should get in the area of 280+ miles per tank, give or take some. I do speed a lot(not that I have that much power to do so sadly ), but last few fill ups, I've tried driving pretty normal, and still the same results. At first I thought I had a leak or something, but since then it's been ruled out.

I do mostly city driving, averaging 40mph throughout most places; Anyone have any suggestions as to why I'm getting such horrible gas mileage? By the way, I've been running it to 'E' and following the trip miles.

 

o2 sensors?

 

have you checked you air filter?

 

Have you checked your tire pressure?

 

Pretty sure I got that replaced a few months ago.

I just recently re-filled them, about 3 weeks ago; each is now around 34 or so.

 

spark plugs??? what octance gas do you use for ur car and what does it say you should use? ot driving with ur e-brake on are you :p 4 cylinder ought to get great gas mileage

 

Lmao, nawh last time I tried driving with the e-brake on, I went no where which scared the crap outta me, then I noticed


I just starting using 89 again, not sure which is the recommended for my car, I'll have to check that out.

 

one time i let my brother borrow my car and he put regular in it..i bout had to crack his head my car ran like total $%&^ hahaha

 

if he has a 4 cylinder santa fe, premium fuel will do nothing for it.
keep using regular fuel.

O2 sensors get lazy. check O2 fuel trims.

 

another thing to to check, unlikely scenerio but it did happen to my pops. have u noticed that ur brakes are smelling really hot like you've been using the hell out of them? My dad once had a brake caliper issue and they brakes were actually on constantly even when he wasnt applying brakes. the piston in the caliper was locking up and not releasing fully. that really dropped his mileage. doubt thats ur issue tho

 

Nawh brakes are all good, Im going to check out the o2 sensors though, sounds plausible.

 

100 miles to E on a 17 gal tank is ~ 6 mpg. I'm going to guess that you have a hole in your gas tank or your neighbor is stealing your gas.

 

There has to be something seriously wrong with the car for you to get 6mpg.

Are you Stig?