Thinking about it more/math.. I would probably want to drive it for at least 3-4 hours to be happy. Figure 70 mph (between going fast and going slow)
That's ~300 miles. Get three other people. Each do 300 miles
1200 miles - 100 original miles = 1100 miles * $.75 = $825 extra
$825 + $700 = $1500
So maybe $300, 400 a person. Plus gas. Calculating this conservatively.. And I included a lot of driving..
Hmm...