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LPG: Liquefied Propane Gas
Throw away your spare wheel and replace with similar shaped propane tank.
Install propane kit, including injectors, computer etc. Cost in Poland is about US dollar 1500.
Cost of gasoline, Norway:USD 2 per liter. Propane USD1 per liter. Milage approx the same on both fuels. Loosing a small percentage of power on propane.
Sorry for fingertrouble finding the right thread section.
John