you need to figure your cost per mile then go from there
duromax should get 20 mpg, $5/gallon 750 miles
750 miles x 20 mpg = 37.5 gallons
37.5 gallons x $5 a gallon = $187.50 in fuel
750 miles / $187 = $4 per mile
i would charge at least half, so $2 a mile MINIMUM or you ARE doing him a freebie
