It wasn’t the most aerodynamic SUV on the road, but the luggage didn’t seem to slow down this family chariot on Thursday as it barreled south on I-95 in Delaware and Maryland. Like almost every other car on the stretch between Philly and D.C., it was going at least 70 mph and it was clear that — despite the national angst over energy — getting there in hurry trumps cost, especially when a family getaway is in progress.