The diesel engine was orginally designed to run on vegetable oil. I think peanut oil specifically. Ethanol is a great powersource. Panoz had a hybrid several years ago. I've often thought a new Group C style formula would be a great way to liberate the rules and to see some new stuff out there.
Also. The turbine powered indy car. The "whoosh car" was banned because it didn't make the proper race car noise (sounds familiar huh?). Of course that wasn't the official reason, but it's the real reason.
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