I test drove the 2007 RL, the same vehicle 3 times over a 7 day period. On my last drive, the temp was 95 degrees and after a 15 minute drive the car stopped in traffic and would not start. The dealer's service manager claimed that this problem happened occassionally on TLs but never on the RL. That was enough for me to balk at buying the RL. I wonder if I am over reacting to my experience. I have not seen this problem mentioned on this or anyother site. I thought vapor lock was a thing of the past. Thanks for your comments.