I just bought 2007 GT with the 3:55 rear end option. I have had a 2000 and 2005 GT's in the past all with 5-speeds Transmissions. Both the 2000 & 2005 would indicate 68 mph at 2000rpm both having the stock 3:27 rear end. The 2007 with the 3:55 rear end seam to indicat the same about 68 mph at 2000rpm. I thought that I would see a difference maybe 65 or 66mph at 2000rpm. Has anyone else noticed this or would know why I am not running a higher rpm at 68mph?