The typical California store sits at 4.55, the lowest of any state with real scale in it. The typical Iowa store sits at 4.75.
Put that in reviews instead of decimals: a store at 4.6 with 1,000 reviews would need roughly 570 straight five-star reviews, no misses, to reach Iowa's median. The identical store in California is already above the line without writing a single one.
It isn't brand mix
The intuitive read is that the coasts carry more luxury and import stores, and luxury buyers grade harder. That’s half true — but luxury stores rate higher, not lower (4.70 vs 4.65 mainstream), and imports beat domestics 4.68 to 4.63. The coasts carry a mix that should rate better.
Compare like to like and the gap only sharpens. Of the 19 brands with 40-plus rooftops in both regions, the West store trails its Midwest counterpart in 17 — Volvo by a quarter star. Same badge, same training, different zip code, lower number. It isn't effort either: West stores respond slightly more often, not less.
One number, four rulers
The same rating gets read at every level — GM, group office, regional OEM, national OEM — each against a different cohort, none asking what "good" looks like where the store actually sells cars. That's not a knock on any scorecard; it's a calibration gap.
A national yardstick misprices a local market both ways: it lets an easy market coast and penalizes a hard one. A baseline that adjusts for local dynamics is how you tell a coaching problem from a zip-code problem, and where training actually moves the number.
And the map is finer than any region. Within California alone, county medians run from about 4.3 to 4.7, a wider swing than California to Iowa. Your shopper never sees a region. They see you and the five stores they'd actually drive to.
So the baseline is local. Before you defend your number, or accept someone else's read of it, go find out what a 4.6 is worth on your street. Then bring the gap, not the rating.
