Good Morning Xoie I.
There is some truth to your thinking.
But you really do need to factor-in overall vehicle running cost too as important as just fuel-in useages.
IF you want long service life out of exhaust-turbo-chargers and engine belt driven superchargers you will have to become dependent on much more expensive synthetic grade oils.
It’s true. The exhaust-made hot turbo charger center bearings will cook and carbons crystallize normal, inexpensive engine oils.
And factory supercharger systems like GM/Buick and others proved to need better heat resistant engine oils too.
My wif’es last choice of a late model Ford Edge as a case in point. Three different engines available: a dual-turbo 2.7L V-6; a naturally aspirated 3.5L V-6; and a sports dual-turbo 3.5L V-6. The turboed engines must use full synthetic engine oils. The naturally aspirated one recommend using a much more common, less expensive 5W-20 semi-synthetic. And can use non-synthetic 10W-30 handily in above freezing weather. Much simpler engine controls systems too. With far fewer aging vehicle potential problems.
Supercharged Buick’s are know for many sources oil leak’ers, killing the rubber engine mounts.
And I have never seen a factory Turbo’ed system that at 10 years+/150K miles that had not become a turbo oils and coolant water leaking mess. (The best factory systems DO engine coolant loop cool the turbo-bearing center section to prevent hot-running shutdown cooking of the remaining in-turbo lubricating oil. The exhaust castings transferring heat over doing this with no longer any air flows.)
90’s and many early 2000’s naturally aspirated engine used to be very cheap to L-O-N-G service life’s maintain. Many of the Honda owners with 300-500K mile swore by using only straight detergent 30W standard oils.
Ha! Then, Honda and Toyota evolved changed to active variable both intake and exhaust valve timing. They then needed 0W-20 motor oil to keep these systems working deep freeze cold starting up, to desert-hot. ONLY super grade synthetic oils can be made in this spec.
You can study up on turbo charger upgrade changes need making by going back to the 1980’s Chrysler original, then StageII, then StageIII systems. Saab and Volvo systems in that same era.
Your high living altitude and you would benefit from some forced induction “normalizing” alright.