It’s not required on my 2022, I choose to run premium, especially on a turbo engine
I get you - it says you don't have to on the Outback but it's the same engine in the WRX. Been friends with a Suby mechanic for almost 20 years and says if you plan on keeping it, run 91/93.
The results are quite shocking, to say the least. 85 Octane vs. 91 Octane on the stock calibration:
Omg, that is nuts. thanks guys for posting that for us.Hello Tacoma4G!
I almost made a new thread on this topic, but I thought we'd chime in with some data and observations we've made on our newly acquired 2024 Tacoma. When we picked up our truck from the dealer, they were kind enough to top it off with Utah's finest 85 Octane.
The vehicle's initial testing and evaluation took place with fuel provided, and the motor was quite audible. While conducting data for later analysis on a specific mountain route, we could see the ECU registering the knock events as we heard audible pinging.
To run the last 1/4 tank of 85 Octane fuel out of the truck, we scheduled some dyno time for baseline testing. Immediately following our dyno session, we filled the truck up with some quality 91 octane fuel, and the motor instantly became much quieter. It's still a noisy thing (IMO), but it's tolerable on 91 Octane. The long term knock learning trims were more favorable on the 91 Octane fuel too. Fast forward a week or so later, we strapped the truck back down for some further testing and development
For those of us without as many gas options, and for clarity of the data; are these octnes on 10% ethanol blend? Or pure?
Proof is in the pudding! Thanks OTT! Since day 1 I’ve been using premium, and ethanol free whenever possible.Hello Tacoma4G!
I almost made a new thread on this topic, but I thought we'd chime in with some data and observations we've made on our newly acquired 2024 Tacoma. When we picked up our truck from the dealer, they were kind enough to top it off with Utah's finest 85 Octane.
The vehicle's initial testing and evaluation took place with fuel provided, and the motor was quite audible. While conducting data for later analysis on a specific mountain route, we could see the ECU registering the knock events as we heard audible pinging.
To run the last 1/4 tank of 85 Octane fuel out of the truck, we scheduled some dyno time for baseline testing. Immediately following our dyno session, we filled the truck up with some quality 91 octane fuel, and the motor instantly became much quieter. It's still a noisy thing (IMO), but it's tolerable on 91 Octane. The long term knock learning trims were more favorable on the 91 Octane fuel too. Fast forward a week or so later, we strapped the truck back down for some further testing and development
*Generally speaking* here, the way Toyota's ignition/knock control strategy aims to keep the engine as advanced as possible on a given fuel, the ECU will generally run more ignition advance and remove any knock based fueling enrichment when using favorable (higher octane) fuels. This will often lead to better economy when using premium fuels.
It’s good to know this wasn’t just my imagination. MPG is up around 1 MPG or so. That alone would not be a reason to use premium top tier fuel but the noise and virtually no auditable pinging (I have never read the ECU to see if anything registered) I feel it’s worth it.
