jcstokes wrote on 04/13/13 at 12:12:57:I use 91 Paul, the dealership recommended 95, but when that went over $NZ2 a litre I changed to regular. Many on this forum seem to think regular is fine for a standard engine. Thank god we don' t have ethanol aside from Gull petrol.
Reg vrs premium depends on the engine itself, if it's higher compression then yes it definitely benefits greatly from the higher octane fuel even if the manufacturer book says it's o.k. to use Reg fuel in it. Newer vehicles have computerized iggy systems with knock sensors that will retard the spark to a point it doesn't detonate even with a much lower octane fuel, but you don't get the performance and power out of the engine that is was built to do. So basically if you have anything over a 9.5 to 1 then you want to run a higher octane fuel if you want it to perform it's best.
R.F.