We measure performance principally using the following key operating statistics: (i) rental days, which represents
the total number of days (or portion thereof) a vehicle was rented, and (ii) T&M revenue per rental day, which
represents the average daily revenue we earned from rental and mileage fees charged to our customers, both of
which exclude our Zipcar car sharing operations. We also measure our ancillary revenues (rental-transaction
revenue other than T&M revenue), such as from the sale of collision and loss damage waivers, insurance
products, fuel service options and portable GPS navigation unit rentals. Our vehicle rental operating statistics
(rental days and T&M revenue per rental day) are all calculated based on the actual rental of the vehicle during a
24-hour period. We believe that this methodology provides our management with the most relevant statistics in
order to manage the business. Our calculation may not be comparable to other companies’ calculation of
similarly-titled statistics