Rmlasalle

I just finished a trip thru Virginia into Pennsylvania on Rt 81 and averaged 34 MPG. I was pleasantly surprised considering the rain and heavy truck traffic we encountered. What MPG averages have others achieved?

fred9x

Good for you. I have a 2019 4matic with 9500 miles and my best highway mpg is just under 30.

ajmtbm

i have had similar experiences. long highway trips always 32 - 33 mpg; 34 definitely o the high side, cant remember if i've ever got quite that high, but have seen 33.5 for sure. I am very impressed by the fuel economy of this vehicle.

ChinaBob

It's been two years ago tomorrow since I picked up my CPO 2017 GLC 300. It now has almost 90,000 miles and it and seems to be averaging close to 30 mpg. Lots of highway miles, typically 5-10 mph over the limit.

karmikan

2017 GLC300 4matic. I'm getting 30 mpg in day to day (mostly country roads and highway). The best I've seen is 33 mpg.

mtberman

2018 GLC300 4matic, mine does 30-31 MPG on road trips through the Colorado mountains. Interstate driving at 80-85 MPH is around 31-32 MPG.

My average MPG for a mix of city and highway is about 22-24 MPG.