Even with the GM O2 sensor it had when I bought it 18,000 miles ago, its gas mileage was still roughly what it is now...and according to the ECM, there'* nothing wrong.

Normally, I'd expect to see clues like a poor running engine (rough idle/stalls/hard starting/lack of power, etc), black smoke from the tailpipe, error code(*), leaking fuel, dragging brake(*), or other obvious problems, but I haven't seen any of these.

I use the same gas brands (always 91 octane) for both of our supercharged bonnies, so that can't be a factor.

So what do you guys think about why mine doesn't get the gas mileage that yours get?
Any ideas? I'd be soooooo happy to see this car get consistently better gas mileage, especially since I've had to dump so much $$$ into this car since I bought it!

That is a big *** tank will...

Or have I missed something?

Try Fuel Injector Cleaner

Throttle body cleaning will definitely help!! I can also attest to the O2 sensor; go ahead and get the AC/Delco, you'll save yourself headaches in the long run. This engine has 90,000 on it and I am getting 20 town and 26 highway.

You know what I meant, dumbass.

LOL.. I think that'* how much gallons of beer Will needs to get TANKED.. depending on where he'* going.. and how FAST he can get there... ha ha ha.. kiddin... maybe..

WAA Willwren Alcoholic Anonymous ha ha ha

Does anybody know how or if he fixed his problem? He doesn't post the result here.

In my opinion it'* completely normal for city driving, i.e. sitting at stoplights 50% of the time. If city driving to you means driving on intra-city highways that aren't completely congested, I'd expect low-mid 20s. I get 16 city, 35 highway.

Well it says in some part of the this thread that he gets much worse as right now I get about 11 highway. In fact I have posted another thread trying to resolve my own problem like two weeks ago and am still working on it. His seems to be having the same problem so I was just hoping someone might know.

My thread
https://www.gmforum.com/t279510/