There were two volvos with V8's. One was the Death Cab and the other was a chevy powered Volvo that caught fire early on Saturday but was back running on Sunday, again...
I see what you mean in the mylaps results, but that sure doesn't correspond with reality. I don't understand why the pit stops are "under-reported". We did 5 driver changes (and refuelings) on Saturday and 4 on Sunday, no stint longer than 1:45-1:50.
The actual timing loop is under the checkered start/finish line (not in front of the start/finish flag stand) which is AFTER pit out. So, to answer your question, you are scored for EVERY lap - it doesn't skip one when you pit. However, the way pit exit/entrance was set up at Buttonwillow last year, you DID miss a lap every time you pitted (when you rolled through the paddock, you missed the timing loop) which made frequent stops a big penalty. Infineon has a timing loop through the hot pit at Start/Finish, so you don't miss a lap there, either.
Cheers,
Dean