The average miles driven per year is presently 12-15,000 annually and at 30 miles per day X 365 = 10,950 which is below the average and if you reduce that figure to 15 miles per day it once again will be far below the average at 5,475 miles per year. These figures are based on a 365 day schedule.
In either case the maintenance cost is reduced based on the typical oil change being performed every 4,000 miles, ruling out any unscheduled repair cost.
The only other way to look at this is to use the standard reimbrursement cost which includes:
Thae average cost is approximately .030 per mile throught most companies and fleet operations. This figure may vary according the geographical area, plus or minus .010
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As stated, maintenance cost will vary according the driving conditions and the geographical area plus weather conditions. The information you received is based on an average. I did mean to say thirty-cents per mile not three-cents.