That is hilarious, because I bought almost the exact same TV and have the same car. Samsung 46" LCD, but I think I bought the one w/o 120hz.
The guys at Circuit City swore up and down it would never fit and they wanted me to pay for delivery in several days (BS, like I'm going to buy it and not take it home right that second). They put TVs in cars all day they said, and it won't fit in a Mazda3. It went right in there, no problem. I was quite smug afterward.