100 octane on stock motor
some use 110 octane in a stand alone unit when spraying no2. also if you have a lot of compression usually race fuel is needed. It would not hurt to mix it, like half and half, but I would not think you would gain alot if any hp going to race fuel on a stocker if running it all 110 would even be good for it. Someone else?
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i use 101 on the stock motor (because of the heat in az) with no problem! 
i run 109 unleaded with about a 70/30 split (more 109) when racing on spray. but 109 on it's own for a stock motor would be a waste of gas AND MONEY AT 6+ A GALLON!! 
if you don't have a problem with pinging? i would run just the 91 on the stock motor! just my .02
i run 109 unleaded with about a 70/30 split (more 109) when racing on spray. but 109 on it's own for a stock motor would be a waste of gas AND MONEY AT 6+ A GALLON!! if you don't have a problem with pinging? i would run just the 91 on the stock motor! just my .02
You may want to check and make sure it is unleaded gas.....I took a chance with leaded 110 by mixing 5 gallons of it with 5 gallons of 93 and that one time alone killed 1 O2 sensor....
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you would not gain anything unless you have knock or timing retard. higher octane fuel burns slower and may actually make less power. as for safety, any unleaded gasoline will probably be safe to run.
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