tuning issue?

[alajones]

I've experienced an INCREDIBLE decrease in fuel performance but car is fine in all other issues. No engine lights, rough idle, nothing. Only has ported blower and tune, 100k. Any thoughts outside of just checking the air filter? The car used to go 220-225 miles on one tank in the city, now lucky to get 180-185. I've used same gas station for 10 years.

 

[Zemedici]

I get 150-180 miles out of a tank. Seems to be the going rate. You could change the fuel filter and air filter, but that seems to be the norm.

 

[CrispyBacon]

Maybe your fuel gauge is off. reading empty before it actually is. If you calculated it by miles per gallon instead of miles per tank it would be a more accurate test

 

[jjk23]

Did the decrease in fuel economy follow any changes made to the car? (pulley, tune, brakes, etc.)
Hopefully it is something silly like a stuck piston in one of your calipers.
Good luck.

 

[alajones]

No changes to the car, just gradually lost fuel economy...