Honestly pretty insane, my wife got just over 32 on her last long trip and the published highway mileage of the car is 25.

You absolutely should not, but you should do it anyway

Also own both and love them in different ways. My wife finds the A4 way less comfortable than pretty much any BMW we’ve tried tho, she doesn’t like the suspension. I think it’s fine but there’s also exactly no difference between sport suspension and comfort, which is mildly annoying. I like the Audi interior and overall design more but the electronics are super laggy and feel pretty ancient compared to most other brands. Both are very fun to drive.