AC on, CNG mode: what km/kg are you actually getting?

ARAI rates my Creative iCNG at 26.99 km/kg (https://www.autocarindia.com/cars/tata/punch/mileage), and I know that number is a lab figure, not a Chennai afternoon with the AC on full blast through Guindy traffic.

I've stopped even glancing at the ARAI sticker. What I actually track is the gap between that and what shows up on a full tank to empty basis once the compressor is working overtime. Tornado Blue soaks up heat fast, so my AC runs harder than I'd like admitting.

So tell me honestly, what km/kg are you logging with AC on, city only, no highway stretches mixed in? I want a real number from real owners, not a brochure one, before I start telling people what to expect from this car.