You're just spoiled by Western roads. But I heard that flying from Pittsburgh to Boston area only takes a couple of hours, but the drive takes 7 hours or so, thanks to horrible roads out east. West of Missisippi I use the following rule of thumb: part 103 is slower than car, C-150 is half faster, common LSA or Cherokee is twice faster, and a travelling airplane is 3x as fast. It works pretty well, considering. For example, a drive from Albuquerque to Las Vegas takes 10 hours, LSA covers it in about 7, and Arrow in about 5. Albuquerque to Phoenix takes 7 hours (worse roads), Arrow covers it in 3 (or a bit less). However, in New England even C-150 gains an advantage -- if weather cooperates. Or so I heard.