Gas Mileage

Asked by Jul 29, 2016 at 04:58 PM about the 1994 Chevrolet C/K 1500 Silverado Extended Cab 4WD

Question type: General

I have a 1994 Chevy K1500. I seem to only be able
to get 10 mpg city. I have a singlestraight pipe, 3"
from the headers to a 5" tip. I dont drive very far all
the time but the little miles add up. Is there anyway
I could make it better

3 Answers

105,485

That maybe part of your problem, if there is absolutely no back pressure in the exhaust system the O2 sensors are staying too cool so the computer thinks it is running colder than it should so it fattens up the fuel mixture, you can also check the sensors with a scan tool just too see if they are reading correctly, if the ACT is reading too cold as well as the ECT it can cause a drop in fuel mileage, also make sure the base timing is correct. I assume that you keep it tuned up. Might check the rear end ratio, if your lower than 3.73 there's not much you can do without regearing the rear differential. Also these engines do not like this so called fuel we have today, you might consider running a bottle of StaBil Marine with every fill up, it helps with the problems associated with todays gasoline. HTH

20,065

I have a mostly stock 1995 tahoe 4x4. I can't break 11.5 no matter how hard I try. That exhaust isn't helping anything tho. Unless you have the rare diesel truck

105,485

I had a 96 Tahoe, it got 14.8 regular as clockwork until this garbage for fuel was in introduced then it dropped to 11.8 and nothing I did could change it.

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