To my knowledge there isn't one.
I have a 1986 Honda elite 80 and I average about 90 mpg. Mine tops out at a little over 40mph. I have seen advertisements that say 80-90 mpg, which is true.
the Honda xr 80 has 4
80
CR 80 is a six speed.
15 to 16 U.S. oz.
5
if it is a 2stroke it can go like 90+ depending on the condition of the bike. if its a 4stroke it can go about 80 on the road
8.9 hp.
about 70-80 mph
Since each cubic inch is 16.387064 cubic centimeters, you can just multiply 16.387064 x 80 = 1310.96512 (CCs) So Eighty Cubic inches is about 1311 CCs, and yes that's a big motor, about 1.3 Liter. I think I once had a Ford Escort (car) that was powered by a 1.8 Liter motor, but that was a 4 cylinder.
CCs do not equate directly to HP, but it would probably be in the range of 20 to 80 CCs.