Comparing the i7 MBA and the i7 13" MBP to the M1 MBA may give us some clues: https://browser.geekbench.com/v5/cpu/compare/4652543?baselin... and https://browser.geekbench.com/v5/cpu/compare/4653087?baselin...
It might be a bit of a stretch, but it seems possible that these laptops could get close to double the performance with double the battery life.