This is my experience too. I don't know where the CPI ever gets its data. But Inflation is clearly over 100% for restaurants in California. Literally in the last 3 years.
a) The CPI includes many more things than just restaurants. Unless you spend 100% of your income on restaurants, focusing on that specifically isn't very informative.
b) There's no way that inflation is "over 100%" in restaurants in California. For example, a carnitas Chipotle burrito is currently $10. In 2018, five years ago, I ordered the same thing for $8 (I have all the records of my purchases). That is only 4.5% annual inflation over that time period (25% total). I don't feel like checking other restaurants, but I suspect if you actually look at data and not your intuition it will agree with this.
I can also echo this. The prices of groceries that I'm buying doubled in price in the last year. Some even tripled. I'm not sure where are they pulling low double digits in my country, but that's just not my experience.
Is that in the UK? I live in NY and I feel like inflation is something happening to other people. I guess I don't watch prices very closely, but things seems just as annoyingly expensive as they did 3-4 years ago without any really noticeable difference.
Pre-COVID I used to able to run and get lunch for under $5.
Now I'm lucky to spend less than $15.