Over 700 isn't impossible by any means, I've done it a few times (it's easy on the highway), just don't go totally dry, it's really bad for the fuel pumps.
"Driving is like a narcotic, an addiction that can take over lives. It ruins people, breaks families apart, and even kills. Itís habit that needs to be fueled. Time, money, rationality, sweat, knuckle skin, and anyone who disapproves are of little importance to a driver, and are often overlooked. Hi, Iím Nelson, and Iím a drivaholic."