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If it hasn't been mentioned before, a note of caution in taking the TDI route would be considering fuel costs.
If a Prius and a TDI have an equal sticker price and similar MPG, the Prius should have lower running costs. The TDI could be modified, but its modifications would have to net a MPG % increase greater than the % premium diesel has over gasoline.
I don't know how diesel varies nationwide, but I rarely see it below the price of 87 octane. If it's a cents/mile ratio that counts, the Prius wins. If it's an environmental issue, then neither car comes out ahead. A diesel actively pollutes more but a hybrid arguably has more energy invested and contains heavy metals.
- LostCause
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