re: Tell me if this is a good investment (CNG tanks)

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The biggest risk is a price spike making your investment tank

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Yeah, my understanding is the the price of gas and NG tend to move together, so my "profit margin" would somewhat remain intact either way (to a limited extent), but obviously there is some uncertainty there which could easily make the investment less (or more) worthwhile.

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You need to do it on a per mile ratio, IMO.

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Good point - I haven't done this much research on it yet. Again, my rough understanding is that both get about the same mpg, but I would need to recalculate with exact figures.