We are 1200 feet. That’s why you coastal tracks are .10 quicker from the get go. Very common for them to see -600 feet so the test n tuners head out in the Fall for new bests and a bragging number.
The big national event track "Pacific raceways" formally Seattle international raceway is pretty low altitude and plus has Coastal air. I think boosted and his demon at .300 quicker than my track.