Personally, I will not do that.
Evereybody wants to buy a compact car like Civic,i.e, you will not get a
good deal on Civic. paying more on a new Civic and lose some money on trade
(definitely losing).
I am wondering how many years( 10 maybe) does it take to save gasoline for
your loss. Plus, you also lose the better ride in the next 10 yaers!!

Unless the gas price is constantly > $3 and you will keep it for at least
ten years...