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Showing results for tags 'premium gas'.
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Hey guys, I have a 2007 GMC Sierra, basically completely stock besides the throttle body spacer I’ve thrown on. I picked up a superchips flash paq and I wanted to run the performance mod on it to see what it could do. Before I bought it I just recently stopped running 91 octane gas cause it was basically a waste of money for a stock truck, I was just using it to keep the engine clean since it was a well maintained truck. Before installing the mod it says that it needs 91 to run properly. So I was just wondering, before I waste the extra money in premium gas again, do I actually need the high octane gas for this mod or does it still work without it and if so will it cause any problems over time? Thanks in advance guys.
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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.
