Earlier quoted context omitted.
At $4 a gallon, I might even challenge that. I recently calculated the cost of driving from DC to Boston, which is regularly a $240 or so ROUNDTRIP on many airlines. It takes 2 tanks of gas each way (about a 350 mile trip, 20 miles per gallon, 15 gallons per tank). The gas cost alone is close to $240. Even if you managed to burn 3 tanks instead of 4 during the trip, you're talking 45 gallons @ $4 a gallon, which is $…
Driving can still be cheaper than flying if you have 2 or more people traveling together. It would be tough to beat trains and buses, though.
Traveling with a family on a fairly short / medium-haul trip (no overnight stay necessary) with lots of baggage? Driving will trump airfare costs for certain.