Aside from the sheer size of the Dakar entry (about 8 times larger than Le Mans), some interesting comparative snippets:
2013 Dakar total route mileage for cars, comprising:
Link Sections between Special Stages - 4,419km
Special stages - 4,155km
Total Distance - 8,574km
Longest Day - Day 9 - Links of 259km, Special of 593km, Total 852km
Winning Car - accumulated Special Stage time - 38 hrs, 32 mins 39 secs
That equates to an average Special Stage speed of 115 kph/71mph. Pretty awesome considering the terrain compared to the Le Mans track (total distance of the Audi R15 in 2010 over 24 hrs was 5,410.7 km = 224kph/140mph average)
MG Mark