Get sta-bil marine ethanol treatment - it negates the problems that ethanol causes in all vehicles, especially our carbed and older FI vehicles. My 92 honda sounds completely different from when I got it and I added the treatment - and the mileage jumped 2-4 mpg. 1 oz to 10 gal of fuel - 32 oz bottle treats 320 gals of fuel and costs 24.00 at most part stores around me.