Hmm, maybe a little bit of a couple of those. I like the brag and wow factor when people ask me what mpg I get. Also, I'm all about saving a little money on gas, considering I commute 64 miles a day. Hell, if I could fill my Civic up for $10 like I could back in the '90's, I'd still be driving it like I stole it! They still get great mileage even then.
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Not really concerned with the environment all that much and definitely not into hugging trees. It was here before us and it will be here long after we're gone.