What do most of you do as far as deducting for gas for your tow/travel vehicle. Everyone I know in any service industry deducts the actual gas/oil charges as an expense. However when I ask my CPA (who is a ex-IRS agent) he say's the really correct way is to claim mileage. He says with the mileage allowance you are really coming out better than using the actual cash receipt. I just find it really hard to remember to keep up with mileage. I'm thinking this must be a very grey area in tax law. I remember one of our members on this forum is a CPA, maybe he will chime in here.