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Is a diesel CNG conversion like $5000? plus $6000 for cng@home? how many years/decades till you break even (assuming NG & electric stay low cost)?
I could see something low-tec/low pressure, i.e. propane liquifies fairly easily, so separate it out from the NG for your vehicle and use the rest for heating? But compared to a $2k 5 speed beater with basic liability insurance, you are looking at a large money hole IMHO.
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