Not a big surprise, after all, what did they think was going to happen when $5.00 p/gal. gas is on the horizon & your lessee is driving a giant, gas-sucking Detroit Chrome Mountain.
Our company used to own a fleet of Suburbans - got roughly 8 - 9 mpg w/the air conditioning on. A Lamborghini Diablo gets roughly the same mileage. The Suburbans ain't around no mo'!