Just a averaged 28 in our 2018 Charger with the 3.6 on a trip from MD to Topsoil Island NC.that was generally 80mph cruising and a lot of stop and go on I-95 and traffic lights for the last 100 miles or so. If 95 had been clear, I think it would have been about 30mpg. On pong flat stretches of interstate, it would show current mpg in excess of 40mpg. I haven't taken a long trip in my Scat Pack, but I could get high 20s out of my 2010 SRT8 Challenger on road trips with no MDS.