[n4mwd]

I changed to a 15/45 ratio a while back and there was no noticeable improvement in mpg. I have seen 80 mpg under two conditions. When I was first learning to ride and never went over 45 mph. And when I go on long trips and keep a constant speed less than 60 mph. Around town I get between 60-65 mpg. I weigh 220# and based on what other people are saying, its not that big of a factor for mpg. My weight is probably more of an impact on 0-60 times.

It is my personal unproven belief though that the lower ratio sprockets do make the engine last longer by virtue of it making fewer RPMs.

One thing that will give you more mpg easily is to switch to ethanol free gas. My observations say that it isn't much of an improvement, but its there. Not really worth the extra $1 a gallon IMHO.

Reportedly the new 300 will do over 100 mpg if you ride it like a grandma on Valium and never exceed 40 mph.