I would buy vs lease. Most leases have mileage limitations built into the lease and you pay big time when you go over the limit. As far as taxes go you can claim actual operating expenses plus depreciation as a business expense,plus the interest on your loan or you can take a mileage deduction for all of the business miles and also deduct the interest on your loan as an expense.Some people might disagree with me on that but I have been claiming a mileage deduction on a D unit for many years. In 1996 I was audited by the IRS with no problems. If you were to lease I would go with a new unit,I don!t think you want to get locked into a old unit that may give you problems due to inadequate maintenance.