I second Opti-lube products... I have been using Opti lube Summer in my 2022, recently I went to Boost formula to reach max Cetane, but now that my last filling station will soon be forced to sell 5% Bio I may change over to Opti lube AG....
My tractor has a Yanmar naturally-aspirated diesel engine in it. It is mechanical fuel injection still, with an in-line fuel pump. Therefore I'm all about lubricity and cetane. The Japanese are used to high quality, high cetane diesel fuel - not the crap sold in the U.S. API minimum is 40 cetane which all pumps are (some even test low), except for the rare few "premium" diesel outlets that bump cetane a couple points.
So in the summer I use Opti-Lube Summer+, and winter XPD (has antigel and water demulsifier additives)
I realize this matters not to modern full authority electronic, high pressure common rail diesel engines in vehicles (except for biodiesel rot and gel), but there's a ton of these smaller engines out there in tractors, boats, generators, pumps, skid steers, etc.
Anyway, for sure I started using less fuel as soon as I started adding. That is to be expected when a cetane booster additive is used, which means they actually use it (not snake additive). It also means the combustion is completer, cleaner. Which means less soot deposits on the injectors, piston rings, and blowby in the oil. All good.