95 GSR still avg. 29mpg

 

91 ls
187k miles

21mpg average city
28 mpg best city

30-32mpg highway

220miles then i fill up

 

Stock 94 LS Automatic. Recently did a full fill and reset tripometer. I ended up getting around 260 mostly city. Is that normal? Also I have to let it sit a while to warm up in cold weather. That could also be wasting fuel.

Oh it has 100k on it.

 

97 GSR 25 city 30+ hwy.

 

92LS 320-350 miles per tank ~12 gallons, mostly city. 197k and im starting to notice a decrease in mpg's.

 

I get about 250 with a Auto 98 Integra LS.

 

230k miles, 31.5 mpg as of last week, mostly freeway.

Stuff to check for good fuel mileage:
02 sensor
grounds
fuel injectors
plugs, wires, cap, rotor
tire pressure
air filter
clogged cat
vacuum leaks
pcv
coolant temp sensor/thermostat
clean throttle body/IAC

Anything that would keep the ecu from going into closed loop and basic tune up stuff.

 

Well mine was about 30mg when I got it, but after a Cold Air Intake, which has no silicone piping from the tube to the engine head, now gets just over 22 i wanna say..

 

If anything, a CAI should increase fuel mileage. Something else is causing a dramatic drop like that.

My mileage averages 24-26 mpg on gasoline and 18-20 mpg on E85.

 

I only get 250 miles out of a tank as well, and I already seafoamed, did plugs, wires, air and fuel filter, I replaced my 02 and didn't notice an increase in mileage. I'm stumped.