Well consumers don't really seem to care other than just some token crying. The number 1 best seller in Canada is the Ford F150 fashion truck. It has also gotten to the point that Ford is dropping all but two of its car models because no one is buying them:
https://www.ctvnews.ca/autos/ford-s...f-the-car-business-in-north-america-1.3902920
Chrysler already dropped for 2018 the Dart and 200 because they are not selling (enough). GM has made similar moves.
In the end the consumer is buying larger less efficient vehicles so it sends a clear message, fuel prices are not too high, crank them up please. I will say most of the modern big vehicles get impressive mileage for there size but they will always consume more than a smaller more aerodynamic vehicle using the same technology, it is physics.
This tends to go in cycles, there was talk of similar moves (dropping cars) before oil hit >$100 and then there was a short trend to sanity vehicle wise, now we are back to gas price is no concern at the dealership.
IMO, if you have an efficient vehicle I share your concerns about the impact of fuel prices. If you have a fashion truck or SUV STFU...
BTW, best time to hit Costco if you have a fuel efficient vehicle for gas is in the morning (open to ~8AM), shortest line-ups. If you have a fashion truck best time is around 6PM....