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The lower the octane of the fuel the more of said fuel the car will use.
Citation needed. Generally speaking lower octane fuels have a higher calorific value, but are more inclined to detonation. Unless your car's ECU has knock detection, and backs off the ignition timing significantly with lower octane fuel, it won't affect consumption rates. However, it may well up limiting maximum boost in an engine with knock detection and turbos.
Brommers-
I think it depends on the fuel, I know my fuel injected bike uses less if I fill it up with leaded 110 race gas (not enough to offset the $9 gallon ....) Feels a LOT crisper and peppy too which must be the computer giving it more timing.
They use boat loads of ethanol here because of environmental regs and to pad cheap fuel. It actually boosts the octane yet Ethanol has a much lower calorific value than gas.
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It’s the knock related timing issue I believe. Therefore, if you pootle about whilst never labouring the engine I imagine you might not run into a situation where the engine winds the timing back.
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The lower the octane of the fuel the more of said fuel the car will use.
Citation needed. Generally speaking lower octane fuels have a higher calorific value, but are more inclined to detonation. Unless your car's ECU has knock detection, and backs off the ignition timing significantly with lower octane fuel, it won't affect consumption rates. However, it may well up limiting maximum boost in an engine with knock detection and turbos.
Pretty much that, the higher the octane rating the higher the temperature before pre-ignition (Knocking/Pinking) will occur. Most modern cars ECU's will continually advance ignition timing to an optimum level until knock sensors pick up any knocking occurring then back it off a bit, so cheaper lower octane fuel will allow knocking earlier ergo, timing retarded earlier resulting in lower performance and slightly higher consumption
Jung
Dammit
Fixedwheelnut
The lower the octane of the fuel the more of said fuel the car will use. Whether the higher efficiency balances the higher cost of a better fuel is something I'm doubtful of, but it's still a thing.
Related note - I'd hate to see what my C55 did in terms of MPG on basic unleaded, but as it's forbidden in the user manual I'm unlikely to try it.