It sounds like you used the standard mileage rate method that year. Depending on the year, if you were to divide Schedule C, Line 9 by the mileage rate, it would give you an idea of how many miles you drove for the business. You could tell, then, if that made sense.

See this link for the mileage rates for any particular year: https://www.irs.gov/tax-professionals/standard-mileage-rates