Well, the TDI requires synth oil as mentioned, and doesn't have the regenerative braking of the Prius that reduces maintenance costs, but it does have a battery pack that would require replacement in the future. Probably at something like 200-300k miles. In terms of mileage, since the aerodynamics of VWs are so poor, and they tend not to come with LRR tires, so there are likely significant improvements available there. In terms of diesel prices, as long as they don't exceed an average of ~12-14% more per gallon on average, they're right in line with gasoline prices per unit energy. Honestly, if you don't mind the VW, less the engine/trans, falling apart around you, go for it. Otherwise, I'd suggest the Prius since Toyota's overall build quality tends to be so much better.
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