runsrich

o2 sensors have been replaced, The pvc valve is about the only thing I have not replaced. Would that cause my problem if it were bad?

5.0stanger

PCV wouldn't cause that. If it went bad you would just blow out you seals or pop your dip stick out. How about the air charge temp sensor in the intake?

FiveLiterRiceEater

you should consider yourself lucky you get 18. at most i get about 14.

5.0stanger

Do you still have your cats? Maybe they are going bad and causing a restriction. Auto or manual transmission?

gr84u

Seriously I get about 12 I think, and not many mods :-(.

90GTRagtop

I'm all stock on a 90 Gt Convertible AOD and I get between 20 to 24 mpg in mixed city/highway driving. One person metioned tires, make sure they are inflated properly. Also, did you change tires recently, and particularly did you change tire size? Also, did you clean your throttle body? Did you check the computer for any codes? Wouldn't hurt to try a seafoam treatment for your upper motor and injectors.

Crazyfast50stang

Did you start using differnt gas? How about your air filter? Is it clean?

SAKONNA

I dont think the these new fuel mixtures are doin our stangs really well either. When that MBTE was introduced, my mileage, dropped 2mpg.......same drivin style. To give you guys an idea, I am still on my original clutch and I got 138k.....Hey, I'll still lay down a good second though LOL!!!

5.0_PR

BADASS!

runsrich

I have no cats same size tires a new k&n air filter I use the same gas and when I ran the car on the 3m professonal injector cleaner it was supposed to clean the intake an valves. Like I said I didnt change any thing and the fuel miliage went from 23.5 one week to 18 the next and after doing all the work I have done it is still 18.