Check you floats and your gap on spark plugs my mxz was gaped at 30 thousand i gap to.018 thousand,(stock gap) i got twice the gas milage.my floats were off a little to,higher octane will burn hotter then low,Crash dummywhat kind of mileage are you getting??
Using Higher octane fuel won't get you better mileage, you'll just be throwing money away.
you need to compare your mileage with other, similar sleds to see if there actually is a problem, then try to troubleshoot and resolve the issue.
If higher octane fuel provided better milage, everyone would run it.
Higher octane won't do anything unless your motor is designed to burn it(higher compression etc)[/b]