MBA 2020 (early) i3, i5, i7 are scoring 972, 1048 and 1113 respectively.
MBA 2020 (late) M1 scores 1707.
thats 175% of 972 and 150% of 1113.
Am I wrong?
Thats a huge leap in performance for the high end, but even more so for the entry level.
Yes. And you're making it overly complicated. Look at the benchmarks[1] for one single model, the 13" mid-2020 MBP, single core performance is 1213. Now look at the very next generation of that machine, the 13" late-2020 MBP M1, single core performance is 1708. What percentage of 1213 would you need to add to 1213 to make it equal 1708? About 40% of 1213 then added to 1213 would give you 1708, so the increase in performance in single core for this model jumping from Intel to Apple Silicon M1 is a 40% increase, not 150% or whatever.
[1] https://browser.geekbench.com/macs/macbook-pro-retina-intel-...
M1 vs intel looks to be a 1.5x to 2x improvement on the air in synthetic benchmarks.