Actually, leases can have a fixed term, as well. Ours are 60 months, with a residual value in the contract if one desires to purchase the equipment at the end of the lease. It allows a much lower monthly cost than an outright purchase. There are also terms in the lease that allow buying out the lease after so many months, if one desires to do so. But again, this isn't leasing a generic truck from Penske.
Ryder/Penske trucks have horrible specs in general. Don't expect anything better than mediocre fuel economy. They control the maintenance, so finding out the details of how and where are important, as is what you are responsible for financially.
I had to laugh at this one. Not because it's untrue, but because of how Prime spec'd trucks way back when. They advertised trucks that were not cut back. But since this was before electronic engines, they spec'd them with very short rears to keep the speeds in check. They were still fairly fast for fleet trucks (this was the double nickel days,) but the result of the short gears were trucks that got horrible MPG. /hijack