Something to keep in mind too is that certain vehicles (like dedicated cng vehicles)
Can be significantly cheaper to purchase up front due to the lack of interest in your area and CNG can be up to half the cost per gge (gallon) meaning even a 15 passenger van might be cost compatible to a full size car and a full size car cost competitive with a Prius.
This assumes your area has accessible and low cost cng stations.
In Wisconsin, cng is common but no longer priced competitively , this is not true in all areas.
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