Larger Fuel Tank?

Does anyone know of a lerger fuel tank available for Challenger?
I'd like to increase my range. With a 440 etc, I get something less than 180 miles per tank. Living in Sacramento, I'd like to be able to drive to San Francisco and back, or Tahoe and back, on a single tank of gas.
I am looking at options to increase my mileage, but what I can afford of these are incremental things. Adding 4 or 5 more gallons will make the car a lot more pleasant to drive.
Oh, and in spite of what they report...

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Author: CHLNGR