Fuel tanks were reduced in size since the S60 got better mileage than the 8V92. The primary reason to reduce tank size is to reduce weight of carrying a maximum load of water or wastewater or fuel. As coaches get heavier, an extra 30 or 40 gallons of water adds another potential 250-330 pounds. A extra 130 gallons of diesel would weigh about 900 pounds plus the extra weight of the larger tank. All coaches (and airplanes and boats for that matter) fight the battle of ever increasing weight.
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