On 21/08/2015 14:00, The Natural Philosopher wrote:
On 21/08/15 13:09, dennis@home wrote:
On 21/08/2015 10:50, The Natural Philosopher wrote:

However a car adjusted to run on low grade fuel either by fixed design
or automatically will still run better on better fuel.



Why?

slower fuel burn usually.
less knocky more power.

That is assuming the engine is set up to use that power, or had a knock
sensor to advance the engine for higher octane fuels.

Otherwise it means less power. There is really no point in burning fuel
later on the downstroke or in the exhaust.