Probably, but with People who drive Jeeps as a recreation, All I hear from them is adding ANOTHER tank to their Jeep so they can go farther without filling back up again.
It'd be even more with an SUV, especially because some tanks are up near 40 or 50 gallon tanks. or even more. Mine's a 23 gallon tank.
It's probably been done, although I don't know of anyone here that does it. The only problem I see is less accurate fuel data if you don't have instrumentation because you have less gallons to judge on every tank, you you mileage might be crazy high one tank and really poor the next if you only had 2-5 gallons to take measures from.
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