Lets see there three different engines and three different deck sizes used on the Maverick. But least the tank capacity is the same at 6.5 gallons. And as Bert noted mowing conditions are variable. What someone calls a normal yard maybe totally different what call I normal. For me my yard is nearly six acres and level. The neighbor's yard is 5 acres with a slope (grade on about 3.5 acres). He burns more fuel than I do using his mower. And striping will add to the fuel consumption too as it adds drag.
Probably best to talk the salesman at Bad Boy as got a lot more experience with their equipment performance.