Temperature also have a big impact on mpg. I was getting 25.5 mpg average over the last few months in NJ; 90% hwy driving (not flat road however, lots of ups and down). Last few days the temperature raise up to 50F I can do 29 mpg on the same road. That's with winter blend fuel so hopefully it can do higher with summer blend.
I have ECO mode on when cruising and average speed at 70-75 mph on hwy.
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