Here is part of a TSB from Chrysler. Speaks for itself.
Using premium fuel with a higher than recommended octane rating is not recommended. Owners who experience fuel related cold start and warm up driveability problems should try a gasoline with the recommended octane rating or different brands of gasoline until they find one that provides good performance.
The octane quality of gasoline is only a measure of its resistance to spark knock. The use of higher than recommended octane gasoline under normal operating conditions does NOT improve startability, idle quality, fuel economy, driveability, acceleration, engine durability, or emissions. Customers are most likely to experience poor driveability with premium gasoline than with regular.
Car hard to start in the morning? Lousy idle? Change your petrol.
"I married Miss Right. I just didn't know her first name was Always."
I used to use the Nulon stuff until the town I am in got Premium. My bike runs 10:1 pistons, took away the pinging under load and ran heaps better. I use Premium in my EF2 Ghia (XR motor) when I can afford it, get a bit more mileage out of a tank(about 50-80), tested this on drives to the coast .
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