Rodger, The current bill now is $147.77 with one driver. To add another driver would be $13 a day and I have estimated the fee rate to be approximately 28%. I determined this after speaking with the Budget counter at Portland and comparing similar contracts; we won't know our actual additional fee charges until we arrive and pay for the second driver. So, the math is $39 ($13 X 3) plus $10.92 ($30 X 0.28) = $49.92. Since this is approximate I would say to expect to add $50 to the original $147.77. That total comes to $197.69 plus gas. Split two ways that comes to approximately $100 each plus fuel. I reserved a compact (Ford Focus type) and they get respectable MPG.
Let me know if this is works for you. E.