LOL! yep I have change gears enough to tell which is which by the mpg
my 85 truck 318/727/2.76 gets about 18 mpgs 3.55 down 15 mpgs
my lumpy whiplash cam 440 with a street dominator intake 750 edelbrock headers/3" pipes/muffs/29x15x15 M/Ts gets a steady
10 mpg with 3.91 or less depending on how long at WOT
10-11 mpg with 3.23
12 mpg/hwy with a 2.76
when I had the 85 truck 318 & NV4500 granny gear 5 speed turning a 3.55 gear/235/75/15 I rolled a steady 20 mpg/hwy @ 60 mph
my 82 iron head sportster 4 speed got 56 mpg with a 2.2 final gear ratio but dropped to a 43 mpg with the 2.5 final gear ratio
BUT! going from a 3.5 fuel tank down to a 1.9 fuel tank = walking sooner the first ride.
