My 99 has the SOHC with 4.10 rear and I was getting a consistent 12 mpg city and 17 mpg hwy. After doing the exhaust, opening the intake, synthetic fluids and a BamaChip tune I now get 14 mpg city and 21 mpg hwy.
That's not bad because I don't granny the accelerator. I'm not hard on it (often)...