I went down one tooth, using an 04 GSXR-750 (I wish they would add more letters and numbers to that bike name) sprocket from fleaybay. OEM Suzuki has the rubber dampy sides too, like the Triumph OEM.
So far however, I haven't noticed much increase in fuel economy.
"I tried to move my mind there and nowhere else and imagine a single detail that, if I didn't see it that weekend, I never would... The world is easily lost."