Very similar experience. 300 miles in my 2015 235x with 32K miles on the odo. Overall did just around 30 mpg at a pretty fast clip (average 63 mph over the whole trip). I tried ECO for a while, but it kept on yelling at me to slow down and I was keeping up with traffic, so I turned it back to comfort. No reason to use sports on the highway, IMHO. Pretty happy with the results.
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