I'm thinking 22 gallons stock, add another 44 gallons for a total of 66. 66x3= 198 gallons, 2800 miles/198 gallons= 14mpg totally doable at higherish cruising speeds. I think mine gets about 26 mpg at 70mph.
Printable View
I thought what was really interesting is that the car had 115,000 miles on it!
Always wanted to do this run. It's such a cool idea and big bragging rights if you set a record.