Leaving the house with 2.2 gallons of fuel measured out of my 5 gallon gas can, I drove five miles over to get some 91 Premium... 13.1 gallons went in and I couldn't stop smiling. I was checking everywhere for leaks as I couldn't believe what I just witnessed. Appearance wise, the two tanks are IDENTICAL in external dimensions, so this must mean that internally the VX tank is blocked off to the tune of at least 6 gallons.