I've heard that some of these places operate with covering a certain amount of gas, from point A to point B, and then if you spend more than they estimated (may

I've heard that some of these places operate with covering a certain amount of gas, from point A to point B, and then if you spend more than they estimated (maybe you needed to take another route because of traffic jam), that's on you. You then deduct that mileage. But again, that sounds like a massive hassle if you're doing these gigs 365 days a year, and need to collect all documentations.