Is premium fuel "better"? Is there any evidence that premium and/or high-octane fuel (petrol/gas for cars): 1. improves performance; and/or 2. improves engine longevity; and/or 3. improves mileage so that money is saved on fuel, even when taking into account the extra cost of it I'm somewhat sceptical of the claims of fuel companies, especially given the price of premium fuel. Have _independent_ tests been performed?

Seems to be a yes based on this:

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> Remember this is completely standard car, no mapping no toys just as it came from the dealer. Peak power went from 272bhp to 293bhp – 20bhp for doing nothing more than putting better fuel in the car. MPG also went from an average (dash display so hardly that accurate) 22.3mpg to 24.8mpg and that only took three tanks, its now on 25.6mpg now that its modified. Its a free lunch, it really is. But don’t trust us, try it, just run three tanks through the car, we can guarantee that the car will feel better, you’ll get more power and cover more miles, try it.

!Fuel Comparison