The fact is, there is an increased chance, albeit small, that LSPI can happen. The mostly likely scenario is with a turbocharged, direct injected (D4s = port injection too) engine driven easily. That fits my daily situation more often than not. 93 gives me a bit of headroom and is a personal choice. That's all. I'm not hunting for performance gains and the additional cost isn't an issue.
As mentioned by “Slappy”, it’s a multipurpose additive that’s been around for a while. I’ve used it in most of my vehicles. I can’t claim it makes a difference, but I like the idea of a little extra fuel lubricity.
There are some dyno results on a stock engines that seem to say otherwise. How accurate those are, I can't say. But as I said in an earlier post, for me it's not about that. It's just a safety margin for a forced induction engine.
Sadly we all are. And it's not just gas. Have you priced motor oil latey? And wait until truck drivers and transportation companies can no longer absorb the cost of $6+ a gallon for diesel. There is only one direction that cost can go.......the consumer, i.e. you and me. It's already started with some companies. It literally effects the cost of everything.
Pass a gas station and turn around and the price has gone up .30 cents that fast. OKeep in mind the Iran conflict and Russian war have no real bearing on the artificial increase in fuel prices. It is merely speculation and profiteering that has increased prices that much. Just wait and the prices will drop incrementally but never get to quite the level they were at the first of the year.
This tread is going and going and going. The gas makes no difference as far as LSPI concern on the title. The real reason ISN'T known to specialists and industry alike. So far oil is to blame and driver's lead foot. The oil escaped at valves or around the rings remaining in the chamber and not evacuated on the down stroke. The oil industry come up with the recommended kind specifically indicated in our Toyota's hand books. Driving practices as well like let the engine warm up and don't floor it at low RPM. Better down-shift and go on with your life. Better gas isn't a bad idea and everyone with his chosen brand and quality. But don't associate a better gas with preventing LSPI.
Higher octane certainly can't hurt when it comes to LSPI from most everything I've personally read.
With a turbo the most frequent injection of engine oil into the intake is from a damaged turbo seal. In the early 80s GM offered a 3.8 liter turbo in Pontiac models. At low mileage the turbo seals failed and the engine sucked oil enough to foul plugs and create a smoke trail that Navy destroyers envied. Cooldown and idle after heavy use will stall failure.
Ethanol-free fuel is about the worst thing you can do for a modern turbo engine. Ethanol adds additional knock protection and all modern vehicles are designed and tuned for it in mind. In a previous life, I'd review datalogs from 100s of tuned cars and it was pretty easy to spot when someone was using E0 fuel because the car would be knocking like crazy.
