Quote Originally Posted by VX KAT View Post
Some here mentioned they had some increase in MPG when they used Premium all the time.....so I tried that for a while...like 13 months!....didn't see much difference and went back to regular.
Premium has VERY little to do with efficiency or power. Anyone interested should read this article from a recent issue of Road & Track:

http://www.roadandtrack.com/auto-new...m-fuel-futures

I am especially glad he says "In fact, depending on its blending, a premium fuel may actually contain less energy per unit volume than regular."

More Octane does not equal more power. Use the mfg's recommended grade. That's all. The only other significant difference is how much non-gasoline is in your premium gas. More super detergents in the premium fuels actually means less real gas per gallon...

I put regular in my VX and Triumph bike, as recommended by Triumph.

The only exception to this is one gas station near me that sells premium with ZERO ethanol during the summer (as opposed to 10% at all other stations). That can make a difference in power and efficiency since ethanol has a lower energy content than normal gasoline. But it's spendy stuff - usually 30 cents higher than I pay for regular. I have only ever put it in my bike and gotten an extra 40 miles out of a tank (before the light came on - I kept waiting, and waiting, and riding really slowly).