Hard to tell what kind of efficiency you're getting from watching the needle. Try doing some pump measurements to get your miles per tank.
So many factors involved in getting the best mileage. Best thing I can recommend is get a short ram intake so you're breathing warmer air and maximize your tire pressure. Also lay off the brake. Killing momentum kills efficiency so try letting go of the gas when you think there will be brake tapping instead of trying to draft someone and slamming on your brakes. No drafting a car does not improve mileage.
Let go of the gas when exiting off ramps too and slow to a stop instead of riding the gas until you stop. Most of the time the light will turn green so you won't need to do a complete stop.
So many factors involved in getting the best mileage. Best thing I can recommend is get a short ram intake so you're breathing warmer air and maximize your tire pressure. Also lay off the brake. Killing momentum kills efficiency so try letting go of the gas when you think there will be brake tapping instead of trying to draft someone and slamming on your brakes. No drafting a car does not improve mileage.
Let go of the gas when exiting off ramps too and slow to a stop instead of riding the gas until you stop. Most of the time the light will turn green so you won't need to do a complete stop.