I am not an expert but I would not recommend using a civic for a tow vehicle. I did however see a Scamp
13 going up the highway behind a small older Subaru. That guy had it really loaded down, I felt sorry for the car. These Scamps are a lot heavier than the 900 pounds they advertise, check the site for real life tongue wieghts put together by some folks here.
Honda Civic Towing Specifications | eHow
I used a 07 highlander with a 3.3 liter engine which was more than adequate averaged 15 mpg mostly except for windy days when it dipped to 13 mpg.
All that being said..Are you serious about spending this kind of money because I could help you get the trailer then you could work out the tow vehicle later. PM me