2017 EB convertible, 3:55 gear, 6 spd auto, using 93 oct gas from Costco, stock. Have averaged 28 mpg for 38K miles. Interstate gets low 30's consistently running 65-70 mph. Have gotten as much as 35 on a long flat interstate run at 65 mph.2016 EBPP with 54k miles, bone stock motor. New block and head with 1k miles accrued so far. Both before and after the new motor, my display has always said I average about 23.x mpg. I do about 65 highway, 35 city. I was expecting around 25-26 mpg, but figured the 3.55 gears aren't doing me any favors there and I've been "breaking" in the block so I'm varying rpm quite frequently and not necessary focused on mpg. Now that I'm past that period, I'm driving more normal, but still not impressed by the mpg. I drove about an hour yesterday, all freeway, and intentionally kept it around 65-75 tops. That yielded me a max of 27.8 mpg over the course of the trip.
I've seen plenty of people in other posts saying they're getting 30-35+ mpg during highway driving...are these people driving 50 on the highway or what am I missing here? Are these motors really that finicky or are they really all over the board?
I very rarely see boost as well, it's not like I have a heavy foot. The only thing I know was affecting it was it was 100+ degrees and of course the a/c was on. I'd expect a couple mpg increase in better weather with no a/c on, so maybe I need to wait for cooler weather before I start complaining...lol