I think you've hit the nail on the head......
Sometimes the answer is the most obvious..... they just got the data switched for the performance #* on the two cars.....

The horse powers wrong also on the grand prix :?

Bah! I never trust the #'* that are out there. You want solid numbers, find them out yourself. Within reason of course.

i believe all the SSEi 96-99 0-60 times are 7.5-7.8 sec

Believe what you want.... I've been to the track, and doing calcs I believe my 0-60 time is closer to 6.5sec.... stock.

With a 1/4mile time of 14.9 my 1/8 mile time is around 9.4seconds w/ a MPH of 72.3.
Using the calc provided below, yields 6.47seconds for my 0-60.
http://www.wallaceracing.com/0-60_equation.php

I understand it'* not 100% accurate... but I encourage other members who know their 1/8 mile time and speed to try it out.

if those are ssei time, the GTP has to be 6 flat stock.0r high fives. Somebody has there numbers wrong or the factory test there cars in humid weather when they first come out.

If I had to guess I'd say GTPs were 6.1 to 6.5 seconds
But I'd say my SSEi is a solid 6.5 .... extreme high end 6.9....but I doubt that.

Also keep in mind when they did those tests the engines were probably not broken in.
When I run at the track I make sure that my car is in top working order. I normally have it checked out less then 48hrs before I take her on the 1/4mile for the weekend.

Your right about that.

Edmunds always jumbles stuff up. Either that or they do performance tests on only one Bonny for the year so they put those specs down for all trim levels. I believe Merlin is right, SSEi'* I think run 6.9 sec. 0-60mph stock.