Commuting highway miles. Only about 10% of my monthly driving is local. Dense area, so speed ranges from a crawl to 80+ depending on construction, accidents, and a$$holes. The mileage sucks, but it's no worse than my former 2013 Pentistar was getting. On a steady run going interstate, it'll get 23-24. Just running local, it's 15 or less.
Altitude ranges from sea level to 1k feet, with long grades and moderate hills. All the fuel around here is a blend of at least 10%... winter blend might be higher. The snow tires (Blizzacks) are on, which doesn't help. And mds is still not working.
Two sets of mds solenoids, and still no joy. Wires are sound, can test toggle each solenoid thru the odb port... but get out on the road, and it doesn't re-engage. I'm suspect there's a mechanical issue, but the lifters won't get replaced till the heads/cam are done.
It runs very well with the 87-tune, so I've not been inclined to try others. Bitter cold or hazy hot & humid, it's starts quick, idles fine, and has no hesitation.
No mods to the engine yet. It will remain stock till the rest of the car is gone thru... then it's time to do the cam, timing set, oil pump, heads... You're ride is my roll model. Will do the same FRI cam, advanced as you did. Likely won't port the heads, but will get the seats done. Hopefully there's better mileage at that point, or at least that's when my focus will be on improving it.
This summer, there's rust under the trunk (of all places) and a front end to be done. The brakes & differential if all goes well. Summer of 2024 the mill will have near 200k, and it'll be time. But then again, the best laid plans of mice & men...lol