On the subject of fuel expenses, don't forget that you can write off your mileage. However, I'm unclear as to whether you have to itemize on your taxes to get the mileage writeoff or not. By the time I was delivering pizzas, I was itemizing, so it was a nice little bonus.
Back when I did it, the mileage writeoff usually covered most of my fuel costs. I remember it was something like 28.5 cents per mile, which in my tax bracket at the time saved me about 7 cents per mile on taxes. However, that was also back when gas was usually around $1-1.25 per gallon. I was driving a '68 Dodge Dart that got around 13 mpg in that type of driving. Those were the good old days...start off with a full tank, drive 200 miles on a busy Friday or Saturday nite. Walk out with at least $100 in cash. And the next day (don't want to hit the gas station late at nite with $100+ in cash on me!), I'd use $20 to fill up and get change back!
I dunno what the mileage writeoff is these days. Considering fuel is about 3x as much, in theory I'd think the mileage writeoff should be about 3x as much. But I wouldn't hold my breath! And hopefully you're doing it in something that gets better than 13 mpg, and has less than 300,000 miles on it!