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Is going off petroleum your goal or an aim to another goal ?
If it's pushed by lowering CO2 then it will depend on so much parameters that you will have to calculate the CO2 cost of each solution. American electricity generates a lot of CO2.
Else it seams biodiesel is a great solution while not everybody is doing the same. In France biodiesel isn't available except for buses and other special cases; and the ethanol isn't available in a lot of pump (a few hundred and I don't know a single one...).
An old diesel can also be run with veggie oil, the main problem is to secure your source of used oil.
Denis.
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Earth and health are priceless, so are kilotank and AT-PZEV
Best Mégane tank: 1268.9mi @ 77.847 MPG(US)
2008/06-2011/10 saving: - 5725.5 kg CO2 (5342.6+382.9)
- Diesel / Money: 42.17% = 2446.25€ = 3357.26$
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