I have an R1S on 22s and see very similar efficiency to yours. 1.7-1.8. Average trip is probably 20 minutes.
I have an R1T on 20s that averages 2.1-2.2. Average trip is 45 minutes.
I think the short trip effect is huge on efficiency.
Until today I thought this was an R1S only problem.
Today I forgot to precool my R1T at 5pm. 103F out. Took a full 20 minutes while driving with AC on full out LO to even be tolerable.
Crazy disappointing.