![]() ![]() However, if you ride overseas, they will be posting RON in most cases. Since the manufacturer recommends RON 95 no one including Ivan would recommend less than US premium gas.īottom line in the US, Mid range is probably acceptable as a substitute, but with premium you are always in the proper zone. Note that this ECU flash can cause a fluctuating idle in some 07/08 YZF-R1 models. Retail gasoline stations in the United States sell three main grades of gasoline based on the Anti knock Index octane level or AKI: Regular (the lowest octane fuel–generally 87 AKI) Midgrade (the middle range octane fuel–generally 89–90 AKI) Premium (the highest octane fuel–generally 91–94 AKI). For example, a 95 RON plus an 87 MON averages to a 91 AKI, which is the octane rating you would see displayed on a U.S. The AKI US Octane is an average of two other octane numbers, the RON and the Motor Octane Number (MON), which are determined by two different laboratory tests. On -1 under general Specifications it says Fuel type for all but CA, RON Research Octane 95. It runs terrific! I also bought a shop manual for it. Fuel Maps, Ignition Maps, Secondary Throttle Plate Maps, RPM Limiters and many more advanced settings can be modified allowing you to tune your bike to the limit. I bought a 2021 Vaquero and have Ivan's tune. Woolich Racing Yamaha ECU Flashing products allow you to tune the maps and settings in the Yamaha ECU. You can agree or disagree but that's what works for me and that's all that matters. Race Track, Wal-Mart, Quick Trip and other no names have gas just as it comes from the refinery. When that's not available I use BP, Shell, Chevron etc mid grade. I use COSTCO, because they are right around the corner and cheaper than anywhere else and the pump says 'Top Tier'. Come down a gear or two and I haven't experienced any problems. If you're in a higher gear and low RPM and crack the throttle wide open you'll gonna get some knock (pre-ignition remember?). ![]() Yes I'm Ivanized and I've used mid grade from day one. I've always been lead to believe that most if not all brand named or top tier gas contain detergents, etc. Premium is supposed to burn slightly slower to prevent pre-ignition, or engine knock if you like that term better, in high compression engines. From what I understand, and that may not be much, the difference is in the rate of burn. I wish I were sensitive enough to tell the difference of how much power I can feel between mid and premium gas but I'm not. ![]()
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