dont have a rear o2..its a 95'

 

there is no rear o2 sensor.

if you are getting 15mpg with no overdrive i wouldn't mind seeing what you get with overdrive. sound like you just need to fix it and get it done and over with.

 

 

Something isn't right. At 2150 rpm I am running 77mph.

 

^He has no OD....
So, with no OD that's just a tad high. Granted, I am also running 33's, so mine is going to be lower.

 

Definatly need to fix your OD. The feds were certain that going no faster than 55 would make people burn less fuel, but what/if any difference in economy didnt make up for the anger generated by driving 55 MPH down the interstate. Lol.

 

definitely have to get o/d fixed. city mpg bothers me though lol. 5-8mpg!

 

5-8 is bad, but you probably won't see any better with OD on in the city.

 

At that speed going into OD might just get you worse mpg. You might be at a lower rpm but that does not mean it is the most efficient rpm for the motor/truck to run at.

 

Mpg may not get better but he will ba able to do 65 mph and get the same results with od