Like I said, the computer is pretty close. My RDX shows 25.1 over the last 6000 miles. About half expressway and rest what I would call suburban. I’ve calculated by hand a few times and always came out about .5 less than the computer. Still good imo on 89 octane always over 6 years.

Your mpg is quite a bit better than the average for a 2013 RDX according to fuelly. The 68 RDXs reporting show 22.5 mpg for over 1.3 million miles. Hard to argue with the math, miles driven/ gas used.

I’m pretty sure what helps mine so much is that I hardly ever drive in rush hour traffic.

idle time, rapid acceleration, speed are all part of the equation. The computer measures the amount of miles driven divided by the amount of gas used, simple as that. Real world use. It is what it is.