My knowledge in automobile is pretty much shallow, so I don't know any known improvement as of now. I see a lot of changes in electronics world but I have yet to see any 2-4 wheeler cars for domestic market that consumes less fuel. So far the cars in market are in moderate points when it comes to fuel.
Most of the time the racing is around speed and control, not fuel saving. I doubt they have any goals or even research on fuel saving front in these races. I agree that innovation is driving factor, but it's hard to notice such innovation from domestic front if the fuel part is ignored. Sure, we can see A-list people surfing on moon station, even today, unless it gets cheap in domestic market, it hardly gets noticed.