[mrblueoval]

I cant see any reason that I am getting 15 MPG 60/40 city highway.

I have a PI swapped motor out of an 03 gt. Car is a 5 speed. Brakes are not binding,no cel except for a rear o2 code. Front o2 sensors are new,new plugs,wires,new motorcraft IAC. No vac leaks that I can find. Car idles around 600 or so. It does lack a little low end power but if I jump on it itll chirp second. 373s in the rear. car goes right into closed loop. Shouldnt I be getting at least 19 or 20 mpg also keeping in mind that I rarely jump on it, actually I always try to keep RPMs below 2k. Whats my next move, compression or leakdown test. Oh yeah my wideband hovers around 14.7/1 at idle and cruise by it (the AFR) being at 14.7 wouldnt that indicate it is running pretty efficient ?

[MustGT98allday]

doesnt make sense to me either.
Im at around 20 mpg with a pi swapped npi with crappy front 02's and getting on it everyday.
especially with your wideband reading 14.7/1 you should be really good.
What does the wideband do when your driving around.

[mrblueoval]

hovers from 14.1 to 14.9. Under wot it is in the 13/1 range.

[98BAGT]

idk what your complaining about i get 13mpg with a pi 98gt

[mrblueoval]

Well after reading some other threads where guys are getting 20-24 MPG and sometimes more its a little disheartening. wow you made me feel a little better.

[AdaBoNGT]

Im getting around 15mpg with 4.10s. I also drive it pretty hard.

[MustGT98allday]

oh ya. i forgot to say about 80% of my driving is highway where im cruisin around 2k rpms
if i drive more city its maybe 17 driving normal and sometimes getting on it.
so i guess 15 isnt too bad

[98BAGT]

99% of my driving is city and my go pedal is glued to the floor so i know why my mileage sucks lol