mileage

Transplanted a 4.7 from a wrecked 2000 dakota into 2002 dodge ram. My gas mileage is way below what I was getting with my original engine, and slight smell of gas sometimes when accelerating. Truck runs fine, no sputtering or lagging when accelerating... Any ideas?? thanks guys. :gr_patrio Greg

I drive 2005 Grand Caravan 3.3L with 55K miles and its getting 13.7 mpg in city (down from 18 mpg). Vehicle well maintained and in excellent shape overall. - Had intermittent CEL (O2 Sensor bank 1 sensor 2) and replaced downstream O2 sensor. CEL stopped but mileage has not improved. I have...