Only 25 miles on Sportscarpat Panther tank?

[The 26incher]

A friend of my is claiming he is only getting 25 miles to a tank of gas. I don't know how much gas the custom tanks that Pat makes for the Panther hold but I bet it's close to a gallon? How could this be?

 

[2door]

WOT from point 'A' to point 'B' ? Just a guess.
Tom