Tyre conservation used to be a part of F1 in the 80s and early 90s until refuelling and the pit lane speed limit was introduced. However I am unsure as to what has changed to be honest. Drivers in the 80s (and perhaps 70s also) would often try to finish a race doing 1 stop or maybe no stops, whereas other drivers would stop 2-3 times. The guys doing no stops would have to preserve tyres whereas the drivers stopping 2 or 3 times could really push the tyres. So again, what has changed and why isn't this dynamic the case with modern F1?
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