Sounds like you have a Sedan. I have the Coupe which only has one seat, and the trunk is huge. I didn't mind losing some space when I put in the p/u tank behind the seat under the package tray. It was still a little tight, but I got it in with no problems. I can see where it would be much smaller if you had a sedan, since you would have wheel wells on either side taking up gas tank space. You might want to consider a fuel cell (Jegs and Summit have them), since this will allow you to keep it in the stock location under the trunk instead of filling your trunk w/ gasoline. However, the only sensors I've seen for them are 12v.
