im going to agree with mike134 on the shift points. I only have the 3 speed auto with no over drive. around town im ok on gas...the minute I hit the highway and whine out third gear, around 3200-3400, I can literally see my gas guage dropping.
With bumpers, a little bit of armor, recovery gear, 35's, and the same basic modifications you've done, I average like 14-16 depending on how I drive it and the speeds I stay at. It's mostly city with short highway trips, and I get around 15 out of it most fill ups. I've never been super concerned about it, but now I have a 4 cyl honda that saves on gas most days
I got somewhere around 12-13 with my 4 cyl. I didn't really care though, fuel economy isn't why I have this vehicle. Mind you my driving is 90% city stop and go, and my shift light is usually the red line
You also need to offset your trip meter if your speedometer has not been corrected. I run 30's on my 95 and the mileage offset is 1.11 x trip meter / gallons used. I am between mid 18's to almost 20 if I am driving with the windshield folded a lot. (You can gain a good 1mpg like that!)
I am running a 4.0 TB, & a 2.5" cat back on an otherwise stock motor with 188k
i get 14mpg with 35s and 4.10s in my '95 4cyl. ive done all the mods to it and it definitely improved over stock in idle, mpg, and power. for a few hundred bucks (not all at once) its a great bang for the buck.
4.0 TB , Ford 19lb injectors, CAI, Taurus Efan, and soon im going to move the intake air sensor to see if i get another improvement
'95 YJ 2.5L March '15 YJ of the Month!
Exiled Offroad - Arizona