i really try my best to be light on the gas pedal, i try to maintain 2-2.5k rpm to get the best gas mileage as far as what i read on the other thread.
we use the car during offpeak hrs bec may wife works on a call center, so traffic is not an issue.

i will try your suggestion about the overdrive.

what would be the best FC i can get from a 16 valve twincam sentra Gs automatic? or any upgrade besides converting it to LPG?