Ok, I have a 03' v6. I have cleaned the IAC, throttle body, MAF, replaced 2 front O2 sensors, new single exhaust installed, checked tire pressure/ rotated and balanced them, installed CAI.

I am still only getting about 250-280 miles on a full tank. Is this normal for a v6 3.8? I set cruise at 73 and do mostly highway driving. I'm not heavy on the gas either.

Just wondering as I would expect at least 18-20 mpg highway.

Glenn

 

My cobra got 23 mpg at 75 on my last trip from mass to Maine, my GT did 21 the same trip, and my 6er would do 18-19 but only if I dropped the speed to 68ish, a v8 is working a lot less thus using less fuel to move the same 3200lb car then a v6 does

 

I'm lucky if I get 250 so your lucky

 

id run a bottle of techron fuel injector cleaner, run full bottle on 1/4 tank of gas. should help break down build up around the injectors. id also change the spark plugs & wires. makes a big difference.