Earlier quoted context omitted.
But it's not like his car payment magically disappears when he becomes a Lyft driver. Or magically stop having to carry insurance. It's a good estimate to use for cost, especially considering the author did not even own a car and would have to purchase one.
> But it's not like his car payment magically disappears when he becomes a Lyft driver. Or magically stop having to carry insurance. Right, my point is that those costs are essentially fixed w.r.t miles driven, not that you wouldn't need those things. If you drive 36000 miles a year as a Lyft driver your car payment is still the same as someone who drives 12000 miles a year, whereas the author's model assumes the pay…
http://www.gsa.gov/portal/content/100715
EDIT: Found further clarification. "The TDY mileage rates consider the fixed and variable costs to operate a car (gasoline, insurance, wear and tear, etc.) and are intended to reimburse the average expense of using a POC for the official government travel."