I get typically 330-350 miles on a tank... in city driving. Havent taken it out on the Highway yet.

96 SSE 94k

Generally my car will stall out when its time to put 12 gallons in, so I would assume this means I have a tank between 12-14 gallons, or the fuel pump just doesn't pick up the last of the gallons, which wouldn't be unusual for a GM.

But anyway, I generally get 180 miles out of this tank and I am done, where I used to be able to get like 320, so I KNOW there obviously something up. At first I just counted it by the days. I thought, "hey I used to get four days of commute out of this thing before fueling, and now I get two." :shock:

thanks for the help guys i just put in my O2 after school then i hooked it up to the tech 2 and it said the IAT was throwing a code so i checked it and it was unplugged...weird thing is it didnt even set the check engine light, but i hooked it back up cleared the code. would the IAT senser cuase bad gas milage? i thought maybe with it not knowing the incoming air temp it would run rich but im not sure. and talkin to my dad he thinks i might have a cracked LIM at first it sounded almost like an exhaust leak but its right around the back of the motor so more investigation is on the way and this is gettin long so im out - cody

I get 15-31 miles per Gallon

My car just sucks it stop and go but if I drive it from 55-60 on the freeway I can hit 31

When I hit 400 miles I start looking for gas. (on the 97)

I hit 320 or so I think and I start getting streched out for pushing....So I don't pull a hammy or something.

My 96 sucks it up too in stop and go.
Found a fuel additive that is helping it.
I think its the New England fuel formula.
Can't do anything about it.

I got a solid 20mpg with alot of city and working on the car. So it was running for long periods of time for me working on stuff.

Then I put in my first tank of super unleaded as suggested by the group. My mileage has dropped like a rock to around 15mpg on this tank. I believe it'* because I haven't taken my foot off WOT yet.

I changed the O2 sensor last week as reported and wound up getting an extra day'* worth of driving out of a tank. I'll take it. Right now I use 87 octane gas, but that'* only because I couldn't see the difference in MPG between 87 and 91/93 octane.

I don't really have any more work to do on my 93 as far as MPG is concerned. Now... the fun stuff! :D