Quote:
Originally Posted by MikeS
In my small test sample so far our 2018 3.5 gas mileage is improving ~20% while towing on premium fuel. The caveat to that is the premium is also ethanol free so that may be part of the gain and not just the octane.
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Octane rating makes very little difference to fuel economy, but higher can help by allowing for more optimal ignition timing.
Ethanol content does affect the volume of fuel consumed, simply because it contains less energy per unit volume... but 10% ethanol can only cause a few percent consumption increase.
Accurate fuel economy testing is very difficult, due to the impossibility of matching driving conditions.