Board Thread:Game Discussion/@comment-28401107-20160719141808/@comment-26249703-20160719151915

It's most noticeable on long races where you hit top speed. For example, the Endurance even at Indy Speedway, Tier 9 of McLaren Generations: 242mph is the top speed, until you have a couple of heavy crashs, which drops it closer to 238.

As mentionned above, LMP1s will also lose a few MPH at the end of the first Mulsanne Straight section, after a few crashes