Hi there, that seems a bit high from my experience. I run between 88 and 91 in summer with or without AC. Have you replaced your thermostat? Mine is all factory including antifreeze(changed once). But I'm at over 220,000km
I only run Exxon/Mobil/Esso 97 octane as it seems to give me better fuel economy than many others I've tried (BP/Shell/PetroCan/Pilot). My lifetime average is 39.9US MPG(5.895 L/HK or 16.96km/L) over the past 9,961.5 miles(16,031.4KM)since I bought it. It's a 2015 EX with CVT. I use a scanguage...
I recommend the newest technology from NGK, ruthenium. Same price as iridium but smoother cold starts and lower cold start idle. Free MPG/power boost, albeit small (~2% efficiency increase for me).
My lifetime average is 39.9US MPG(5.895 L/HK or 16.96km/L) over the past 9,961.5 miles(16,031.4KM)since I bought it. It's a 2015 EX with CVT. I use a scanguage to get the most of my fuel. I drive about 60% highway. I also installed US model HF wheels for less drag. Live in southern Ontario...