Should I trade in a car that gets 50mpg for a gas guzzling SUV?

I have a Honda Civic that gets incredible 50mpg on the freeway which I love since it doesn't need much gas and gets 600 miles to the tank. But I hate that the interior is cramped especially since I travel often and end up sleeping in my car. The rear seat folds down but there's still not enough room to sleep comfortably. Forget about 2 people sleeping in it. So I'm thinking about trading it in for an SUV with plenty of room that gets 20mpg.

So do you think I should do it or keep the 50mpg car?

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