arightpest wrote:The fuel and its merits argument will go around in a never ending spiral disappearing up its own flue. if you felt the difference good on you, and you feel better for spending more per litre that's your choice. but unless you had a full test rig connected to your car it will never be proved ether way. i have run mine mostly on Morrison's weasel p*ss for most of its 9000 + miles and its worked ok for me and for a 120d auto i have managed a average of 54 mpg. i haven't done this to save a few pence per litre its just that its nearly at the end of my road and any de tours to put a different type of fuel in would blow any so called gains away due to the distance covered to get a different fuel. a car is only as efficient as the man who presses the peddle regardless what's in the tank.
Arcanum wrote:I always found the low down pick up of BP Ultimate better than Shell V-Power/Optimax. But V-Power/Optimax pulled stronger at the top-end.
marco_polo wrote:Right, lets clear some things up.
Ron is resistance to pre-ignition (commonly referred to as knocking or pinking), it has nothing to do with energy content or 'quality'. Shell 95 and 98 (for example) both meet the same British Standard quality.
If your car is mapped for 95 Ron, you will get no performance benefit by putting 98 in it. None.
If your car is mapped for 98 Ron and you fill it with 95, the engine may produce less power than it could, if it starts to pink (which is likely). The ECU (via knock sensor) will retard the ignition until the pinking stops. This obviously costs you performance. Once your car has become accustomed to 95, it will take a few tanks to re-adjust to 98 again.
Pinking can damage your engine, and is more likely to occur in higher ambient temperatures. I would run any turbo car mapped for 98 exclusively on 98, especially in the warmer summer months.
TMP wrote:i thought a modern engine detected and mapped for the RON currently in i.e.. it would stop pinking before it happened at the cost of performance.
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