Really bad gas mileage

[Cobain03]

i can literally watch the gas hand move. i dont drive crazy. i shift at 2k rpms and dont hot rod it. whats the deal?

 

[SaleenGT2001]

so how many MPG?
what are your mods?
if i get on it a lot i get 7 mpg.

 

[Cobain03]

100% stock, down to the air filter. next time i fill up i will put the trip meter on and see but by the way its actin, i get better mpg in my 65 lol.

 

[mustangkid05]

i no i get like 9mpg but my service engine light is on since the h pipe i been getting horrible gas mileage

 

[four six]

i no i get like 9mpg but my service engine light is on since the h pipe i been getting horrible gas mileage

?? The H pipe shouldn't cause bad MPG

 

[ADRENLN]

if your stock something sounds wrong there. you might want to post this in tech.

 

[mustangkid05]

?? The H pipe shouldn't cause bad MPG

thats what i thaught too but maybe there is something wrong with one of my 02 sensors or somethting that is causing it

 

[AmBo]

I'm supercharged and get anywhere from 10-15 depending how much I get on it.

 

[FoxRod87]

I get 19 mpg with my mods listed in my sig. But if the car is new to you the gas hand does go down quick after it comes off of the full mark. It should be getting around 20 or 21 mpg.

 

[MyBloodRunsBlue]

perhaps change your spark plugs faulty spark plugs could cause bad gas mileage

 

[tjmaxx]

Yea try doing a good tune up. Also it might be that your gas gauge is broken. On my truck if I go 50 miles it will say that im about on empty, but in reality I can go 300 miles to a tank. So I dont even pay attention to the gauge. How many gallons is it taking at the pump?

 

[mustangkid05]

well i usually put it just like 10$ wich gets me a little more then a 1/4 tank and thats lasts me like 50-60 miles not even some times what plugs do you guys reccomend?

 

[GToddyT5]

well i usually put it just like 10$ wich gets me a little more then a 1/4 tank and thats lasts me like 50-60 miles not even some times what plugs do you guys reccomend?

Autolites FTW! Don't need anything more on a stock car.

 

[mustangkid05]

ok thanks alot

 

[Dragstr05]

As stated above, the needle does seem to come down VERY quickly after you get off the full mark. Also I have noticed that it doesnt move down simultaneously either. It kinda goes down in increments. Mine might stay in the same spot for 25-30miles and if I catch it move, it looks like a giant drop. I usually get 55-60miles before it comes off the full mark.

If your're having a severe mileage issue, I wouldnt be so quick to think a tune up will fix all your problems. Dont forget we are in winter for starters, plus we now have this 10% ethanol crap (atleast I do), and I deffinately dont get as good as mileage as I was getting this past summer. I'd have to approximate a 30-40 mile per tank difference. I havent "recorded" it, but sure seems that way.

As for the spark plugs...I just changed mine at 95k miles which were the ones from when the car was built for all I know (2nd owner), and I noticed no increase in MPG.

 

[97Vicious281]

Dude I get the same problem. I had went 92 miles last week and filled up with 7 gallons and thats like 13 mpg. I had my MA sensor cleaned out and all that jazz but it still sucks. I can usually go about 280 miles on a full tank which sucks too.