My 1000 lb (cycle and pilot) "cruiser" is not very aerodynamic with its' enormous windshield, no fairings, etc.  However, it gets 35 mpg at 75 mph.  I look to fill up its' wee tank (4.5 gals) about every 120 miles. 
 

 

Heck, my Corvette gets 30 mpg in 6th gear!