Before we get into those cars with impressively big gas tanks, it's worth creating a frame of reference. On one side are the diminutive runabouts like the Mitsubishi Mirage and its 9.2-gallon tank.

Titan Fuel Tanks has introduced a new XXL fuel tank for the GMC Sierra 1500, providing a big increase in fuel capacity for models equipped with the Duramax diesel engine. Titan Fuel Tanks unveiled the ...