locally, in the metro area, we have a rather high ethanol content in the gas to reduce smog--i.e. oxygenated gas. this is particularly true during the winter months. i due notice a bit of a drop in mpg during this time (about 2-3 mpg on the average). about 2 years ago, i am fairly sure that they started adding some ethanol to the gas year round. i lost about 1-2 mpg at that time.
on trips north, like pa, gas from local filling stations provide better mileage (not just due to highway driving) and power.
do you need higher octane? check exhaust gas temps would be one way to check, you could also check the knock retard on your engine (you would need a obd-ii scanner). if you have a fair bit of knock retard, you should raise your octane.
slower burning (93 octane) also means less power (if you could be running 87 octane).
on trips north, like pa, gas from local filling stations provide better mileage (not just due to highway driving) and power.
do you need higher octane? check exhaust gas temps would be one way to check, you could also check the knock retard on your engine (you would need a obd-ii scanner). if you have a fair bit of knock retard, you should raise your octane.
slower burning (93 octane) also means less power (if you could be running 87 octane).
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