My owners manual for my '14 450F says don't use any leaded fuel. Previous owner gave me a big can of U4.4 that he said he would mix in with regular gas when hot outside. Is it safe to use the 4.4 though the manual says no lead? I have been able to get pump non-ethanol 93 easily, but now all we get in non-eth is 90. I was thinking I would mix a gallon or so of 4.4 with 4 gals of 90 to get a better octane rating. I really don't want to run ethanol in my bikes.