Have mentioned before but , will pass along , I buy 5 USA gallons of 116 oct racing gas at local bike shop , I buy high test non-E gas at pump and mix 70% pump gas and 30% racing gas , I add stabilizer to mixture and run it in Norton exclusively , like you never go further than a tank full ..... the race gas is costly here so I use the stabilizer with 100 in name sorry complete name escapes , but with correct dilution it keeps gas for 2 yrs , which is how long the 5 gal can of race gas lasts me ..... hope this helps , non-E gas still relatively easy to find around here .... I’m still using original GF fuel tank with no issues ..... mil carb hasn’t been looked at in years haha!