If you don't pay for the gas in that rig that is in your avitar. Than think about the person who is. I bet there really yukkin'!
Oh no, lol. That's my rig and I have to buy every drop of diesel that goes in. I try to keep my prices at the point where most of my fuel is paid, but I don't want my cust's feeling stung either. They understand it costs money to get me and my equipment to they're doorstep and with the high prices of fuel and parts and every damn thing, the usual repairs and PM's have gone up in price.
I can't complain too much. The mileage isn't bad (11-12cty/17-19hwy@9400lb's running weight) because this is the older diesel that only put out 230hp. My buddy is running around in an 08 dressed just like mine and he's says he's seeing 9-10 at best. (But with 345hp, it goes like a bat outta hell), that and it looks real nice, but I'd rather keep the loot in pocket personally. We live in a high tax area and my taxes on this rig are $300. On his 08, they're close to 2grand.
I keep it clean and in order, these old rigs are cheap and easy to fix, and I can work it to death and not worry about getting a scratch on it.