I never took the time to figure out the MPG but I do know that I usualy get about 123 miles before I hit the reserve. One time on my way to Idaho I was driving into a strong headwind and my speed-O said 110 with me and my wife riding I got 80 miles and needed reserve.

'02 America
CR-II Carbs - 115 Mains not sure about the pilot but the screw is out 2 turns
AI-Removal
K&N Air Filters - Airbox Removal
Straight Pipe

6000 ft above sea