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They are certainly guilty of crossing truth lines.
www.abc.net.au
That’s all I use. It’s says it on the door. The cost/mileage differential favors regular. I’m rarely doing anything but casual acceleration that I should benefit from the ability to advance timing more.
Someone i know works for Shell in the laboratory. I asked about the premium fuels, prior to the increase of ethanol in UK standard petrol. She told me it is worth using every 4th or 5th fill as it doe genuinely cleans the engine. It wasn't worth using consistently unless you were driving a high performance vehicle.
Since the change we only use the premium E5 for the petrol. My Grenadier is diesel and you don't get so many premium pumps, plus if I used the premium I'd have to pay for it. I have thought about using an additive but unsure on these modern engines.
That may be true for Shell, But, Ineos/bmw are only looking at the octane rating. The rest of the stuff in fuel is a variable from supplier to supplier. What if I’m at Exxon, or BP, or one of the local brands we have around here? Maybe they put cleansers in the lower octane. Maybe not in their high. That’s a supplier question not an Ineos engine question.
My understanding from the conversation I had a very long time ago was that the premium fuels on offer in the uk at that time were better for the engine in the long term. This was not Shell specific.
We’re 6-6.20 usd a Fallon for diesel in my area, which is 30% over gas. Diesel/kero/jet fuel is up everywhere.
As "they say in the classics", there are "technical " difficulties, so much so that Shell have withdrawn and shut down their domestic distribution in California... our US forum friends might be able to shed more light on this...
The regulatory and environmental hurdles as well as having to make a special fuel just for the California market has caused most manufacturers to leave the state. Fewer manufacturers and high taxes makes the fuel expensive. I've seen as high as $9.00/USg in San Francisco.
