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Originally Posted by Rolm
The reason i am buying premium these days is due to the fact that premium costs only 6 cents more per litre vs regular gas. Here in the Toronto area the Esso staion sells regular for $102.9, Mid-Range and Premium for the same price of $108.9, I asked the attendent why the mid range and premium are the same price he said they have an over supply of premium due to more people using regular in their cars. As long as premium is sold at that small price difference vs regular I will use premium the 3.8 is running better.
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The primary reason premium has a higher octane rating is because the hydrocarbons in it have a longer chain than those in regular or mid-grade. The longer chain molecules burn cleaner and leave much fewer deposits on the valves and cylinders. Here in Oklahoma premium costs 20 cents more a gallon than regular.
Probably the reason the 3.8 is running better is because the gas has plenty of additives and its burns cleaner. Hence, the engine has more pep.