Other things to consider re: the guy in the G8; he may have been proudly trying out some new chip that was actually slowing him down... he may have changed his exhaust so drastically that he was not getting max performance... he may have had a nasty, dirty air filter... he may have been running some bad gas... he may have had a worn-out, raced-to-death, 237K mile engine with failing compression.
It may have been all of the above.
