Quote:
Originally Posted by Emmerich
CNG has about a 30% lower volumetric efficiency than gasoline.
The tank might be heavier but not when you include the fuel.
Also, natural gas runs .6 - .65 the density of air.
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The empty tank heavier, the fuel lighter but requiring 30% greater volume to get the same miles/tank? So the tank must be larger to accommodate the the reduced efficiency adding more weight?
Does natural gas cost 30% less? Is it subject to the automobile fuel taxes?
I dunno.