In my previous (now deleted) off the cuff answer, I figured it was worse than driving a car solo, although roughly in the same league. I also guessed it was worse than driving an SUV. Let me take a hypothetical trip to Tahoe for a frivolous activity:
Plane: Piper Warrior (why not? it's one I know about), 115kts, 8.8gph. Here to Tahoe as the crow flies (big factor!): 131.9 nautical miles. Flight time 1hr 8mins, fuel used 10.09 gallons. I think the 8.8 number is high -- I pulled it off a web page of a plane for rent -- but the real number definitely won't be as low as the car, below.
Car: Toyota Corolla, let's say 40MPG pretending the entire route is highway. Here to Tahoe on roads: 234 miles says Yahoo. 5.85 gallons used. Of course we won't get the highway mileage in the small roads up the hills, but I don't know what we WILL get. Maybe we'll use closer to seven or eight gallons than six. Still, the car wins.
SUV: previously mentioned Navigator, 16MPG highway. 14.625 gallons used, plus fudge factor for hill roads. The plane's better than that. Of course, the SUV carries skis better!
Then there are secondary factors such as the increased desire to go skiing if you know you can make it a day trip. ;-)
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Re: Equally Evil (unless you count resources to make it in the first place)
In my previous (now deleted) off the cuff answer, I figured it was worse than driving a car solo, although roughly in the same league. I also guessed it was worse than driving an SUV. Let me take a hypothetical trip to Tahoe for a frivolous activity:
Plane: Piper Warrior (why not? it's one I know about), 115kts, 8.8gph. Here to Tahoe as the crow flies (big factor!): 131.9 nautical miles. Flight time 1hr 8mins, fuel used 10.09 gallons. I think the 8.8 number is high -- I pulled it off a web page of a plane for rent -- but the real number definitely won't be as low as the car, below.
Car: Toyota Corolla, let's say 40MPG pretending the entire route is highway. Here to Tahoe on roads: 234 miles says Yahoo. 5.85 gallons used. Of course we won't get the highway mileage in the small roads up the hills, but I don't know what we WILL get. Maybe we'll use closer to seven or eight gallons than six. Still, the car wins.
SUV: previously mentioned Navigator, 16MPG highway. 14.625 gallons used, plus fudge factor for hill roads. The plane's better than that. Of course, the SUV carries skis better!
Then there are secondary factors such as the increased desire to go skiing if you know you can make it a day trip. ;-)