I noticed the mention earlier in the thread of the Royal Enfield Dreamliner. Here's some additional information/photos taken from Vic Willoughby's report on it. The mileage figures are based on Imperial gallons which are larger than US gallons:
The Enfield Dreamliner results:
. . . . . . fuel consumption
. . . . . unfaired faired
30mph 102mpg 126mpg
45mph 83mpg 105mpg
60mph 55mpg 74mpg
acceleration
15-40 mph 6.4sec 5.5sec
40-65mph 15.7sec 13.6sec
1/4 mile 20.3sec 19.6sec
1/4 speed 61mph 64mph
coasting from 60mph
388 yards 500 yards
cheers,
Michael