Aux fuel cell in place of spare tire, with spare on roof rack

Square

I'm not sure where to start...will the fuel cell be round?

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I would imagine most are square, doesn't have to be super huge maybe a 5 gallon size since the Renny tank is only 12 or so.

I run about town and I'm down a 1/4 tank getting to be a pain

I think the major issue is plumbing and how to keep fumes out of cabin when refueling.
 
They already make spare tire fuel cells. Google it. A electric valve to switch tanks and pumps and wala. Only issue I can think of is if the pump is monitored by the computer and doesn't know to run if the original pump is not on.

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