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Showing results for tags '89 octane'.
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Hello all, ive recently bought a new to me single owner 2014 gmc sierra 4.3 4x4 double cab with 43,000 miles on it. It has flex fuel standard and was wondering wether or not i should run e85. It is available local and pretty cheap, but ive heard that if the truck has ran gas most of its life the e85 would cleanse the deposits and possibly clog the fuel lines or fuel pump. Should it be safe to switch over to e85 ? Or could i just start running 89 since ive also read that its more beneficial running 89 or 93 over 87 due to detonation -
Using premium fuel in a vehicle designed for regular fuel is often referred to as a waste of money and no benefit to performance. I believe the Ecotec with flex fuel engine's performance improves with higher octane gasoline. General motors posts different horsepower ratings for a vehicle using regular fuel (87 Octane) and one using E85 (100 Octane). It is logical that octane ratings of 89, 91,and 94 would come in between these two. Currently I am using Shell 89 octane gasoline and see consistently favourable MPG over the Shell 87 Octane I was previously using. My manual says to use 87 or higher. Please let me know if my logic is correct or how it is flawed.
