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i'm not an engineer but if it recommended to use a certain fuel why wouldn't you? do you use a lesser weight oil to get better fuel economy and or free up horsepower? not trying to pick a fight, just sayin.
The guy who tuned my bike here in the UK gave me the option of a set up to run on lower octane, but recommend that I used shell v power 99 octane, he said Harley's here love it and his graph did not disappoint.
SHELL UK OIL PRODUCTS
PRODUCT INFORMATION SHEET
SHELL V-POWER UNLEADED
Shell V-Power Unleaded is the most advanced unleaded petrol ever marketed by Shell in the UK.
Shell V-Power contains Friction Modification Technology (FMT).
Shell V-Power features enhanced octane quality. With an octane rating of 99 RON, Shell V-Power is designed to provide more power and improved responsiveness in many modern cars.
Shell V-Power contains a powerful cleaning formula designed to improve engine responsiveness by helping to remove power-robbing deposits, helping the fuel to burn more effectively and the engine to run more smoothly. Shell V-Power Unleaded meets all the requirements of BSEN228 & BSEN7800.
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