in the 2008 Le Mans 24 hour race, the first six places were diesel powered cars by Audi and Peugeot.Draw your own conclusions.
The rules made the results?
It's all a result of the rules package, which is rigged to favor diesels. The organizers allow diesels more displacement, more boost, and a few other advantages that make it impossible for gas engines to compete. Make the rules the same for both fuels and it's no contest, diesel is not competitive.
Rules should be the same for each Class of Cars.