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I think a diesel is just a more expensive option and adds a lot of extra weight, if you live in the USA (where do you live?), diesel fuel isn't cheap, unlike some other countries that have subsidies that lower its cost less than gasoline.
If you just want a high-performance car that gets good gas mileage, then you might consider using a small engine for highway use, and then a second one for acceleration. This is something we talked about before, instead of de-activating cylinders, use two engines, a small 3 or 4-cylinder (hey, why not a geo metro 1.0L, very light), and then a v6 turbo for max power that is shutoff doing highway cruise. A charger is a big car has lots of room in the engine bay or in the trunk area for a second engine.
This is inexpensive, as such motors are everywhere for almost free, it is just the engineering time to build them into your car. What budget do you have for the project?
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