I know exactly what your dad is going through being I'm an owner/operator as well! My diesel fuel bill is right around 70,000 dollars right now a year, thats with one truck on the road putting 220 miles on a day 7 days a week. If diesel was even as cheap as gas I could be making allot more money!!!!!!! You people that burn gas consider yourself lucky compared to what I and others have to pay for in diesel. I lost 20,000 grand just last year alone because of the huge rise in the diesel price.