I commute in mine daily at that level as well, and when I lost my vanpool due to the pandemic, commuting in my 11 mpg square-body truck was definitely NOT going to cut it! I have averaged 43 mpg overall with 126k on my 2014 diesel cruze and today driving to work the 50 mile average reading on the dash was 50 mpg.
I average 43mpg on every tank. when I use the car for short trips around town it really beats down the average. Watching the fuel economy on my way to and from work I can achieve 47 to 52 mpg if I really try. I just read on another thread about the EGR cooler causing the countdown when the bypass is hindered. Looks like ill be taking apart the vacuum pump this weekend to see whats going on.