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Texas 40 is correct. Our previous bus, 2000 Marathon XL40 had the larger single tank of 250 gallons. Two busses ago our 1992 Beaver XL #34 had 250 gallon capacity but it was 2 tanks tied together. The standard 160 gallon with added aux tank of 90 with tie in hose at bottom of both. Wish prevost would put in larger tanks at factory now. Our current 45 ft Featherlite Vogue has standard 208. Its too small