I would also add that you need to know what the emissions laws are regarding the kind of work you plan to do. Installing a diesel engine that was never approved by the government in a gasoline vehicle is probably a violation of the Clean Air Act. You might get away with it as an individual who operates their car in a state that has no inspections, but once you start doing it on a commercial basis things change. After all, the US EPA is concerned with NoX emissions changes far more than it is CO2 and diesel tends to have higher NOX than gas.
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No green technology will ever make a substantive environmental impact until it is economically viable for most people to use it. This must be from a reduction in net cost of the new technology, not an increase in the cost of the old technology through taxation
(Note: the car sees 100% city driving and is EPA rated at 37 mpg city)
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