interestingasfuck

Due to the sports environmental appeal they have moved to much smaller engines, that are way more power efficient than they used to (1.6lit V6 hybrids) . I don't believe that they actually could run a whole race without refueling, in the earlier eras.

Further more they have added a limit on how many tires they can use per weekend (and per season) as well as how many engines and engine parts. In the "old" days they'd use a brand new engine for qualifying and discard it for a new one for the actual race. I belive that they are down to 3 engines per driver for the whole season.