Originally Posted by mojob
Am I correct in assuming that if you use your truck only for business and use actual expenses instead of the standard mileage deduction, you don't have to keep a log?
Yes, that is correct. You only need keep a log if you are using the standard mileage deduction method. And even then, it doesn't need to be nearly as detailed of a log as Tharrell showed. Something simple like Topsites said works just fine. You basically just need a beginning of the year mileage and end of the year mileage.
Whenever you get work done on your truck at any mechanic or oil change place, they will usually record your mileage anyway. And that just serves to further substantiate what you are recording on your own at the beginning and ending of the year.