Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

How to treat miles driven to the mechanic, gas station, etc when calculating business use of car?
Since you are using the percentage method to determine the home/business use split, I would think that under most circumstances the distance driven to get your car from the dealership to home, and from home to mechanic and back would be less than 1% of the total miles driven. This is an acceptable rounding error. When refueling, I typically do that on my way to another destination and therefore it's not something I count separately.  If your miles driven to attend to repair/refueling tasks are more than 1% of the total miles driven, split them as you feel comfortable in your above examples. I'd calculate the B/P percentages as total miles less maintenance miles, then apply that split to maintenance miles as well.