Regular Vs Premium unleaded

TONX_2

oldagetraveller wrote: »

"I tend to stick with V power or BP ultimate"
That really is overkill for a Yaris. It will run quite happily on bog standard unleaded.

Don't own a Yaris, and my car recommends premium fuel.

TONX_2

Navigator123 wrote: »

I use bog standard regular Sainsbury's unleaded but put a bottle of STP in the tank once every 4 months.

Driving a Hyundai i30 1.4 petrol which is 6 years old with 60,000 miles on the clock for mainly town/short trip driving and averaging 41 mpg.

Tried using Redex once but whenever I added it to any tank, the throttle started to stutter under WOT. Haven't used it since and haven't had the problem again.

AdrianC

TONX wrote: »

...and my car recommends premium fuel.

What's the EXACT wording on the filler cap label, or in the owner's handbook?

TONX_2

AdrianC wrote: »

What's the EXACT wording on the filler cap label, or in the owner's handbook?

Something along of use premium unleaded min 91 AKI (Anti knock index)
But the thread is more about people experiences in general with premium fuel, not about my particular car.

AdrianC

TONX wrote: »

Something along of use premium unleaded min 91 AKI (Anti knock index)

Are you in the US? Or is your car a personal import from the US? If not, step away from Google, and go to your actual car/handbook.

"AKI" is the same as RON+MON/2 - which is how the US measures octane. Europe uses RON, which is a higher rating for the same fuel.

It's impossible to precisely convert, but 91 US is around the same as 95 here. Vanilla fuel in the US is 89 AKI, which is about 92RON - the same as two-star leaded used to be.

But the thread is more about people experiences in general with premium fuel, not about my particular car.

Data is not the plural of anecdote.

I've explained the facts. Seat-of-pants dynomometers and wishful thinking are both very poorly calibrated.

TONX_2

AdrianC wrote: »

Are you in the US? Or is your car a personal import from the US? If not, step away from Google, and go to your actual car/handbook.

"AKI" is the same as RON+MON/2 - which is how the US measures octane. Europe uses RON, which is a higher rating for the same fuel.

It's impossible to precisely convert, but 91 US is around the same as 95 here. Vanilla fuel in the US is 89 AKI, which is about 92RON - the same as two-star leaded used to be.



Data is not the plural of anecdote.

I've explained the facts. Seat-of-pants dynomometers and wishful thinking are both very poorly calibrated.

Considering the time of day it's safe to say I would be at work so a quick google was the best thing. So they recommend premium which is what I've said. Thanks for doing the unit conversions.

Also provided a link to actual dyno readings, have a look when you get a chance shows a vast improvement in in torque and HP at higher RPMs. Although most people with smaller engines won't care since it's dealing with high strung NA motors.

uknick

I ran a manual Porsche Cayman for 9 years and 80k miles. I found Tesco Momentum 99 gave about 5% extra economy. However, as it costs about 5% more there was no real cost saving, although the car was not so prone to stalling at low revs. Did it get any more power? Not that I noticed.

I tried to get a true comparison by running the test under the same conditions; during one summer I used one fuel for 4 weeks and then the other for 4 weeks.

motorguy

TONX wrote: »

Morning All

What opinions do you guys have on regular Vs premium unleaded.
I tend to stick with V power or BP ultimate, but wanted to know your thoughts and experiences, mostly around mpg, performance or engine cleanliness….

Some other forum links
https://www.m5board.com/vbulletin/e39-m5-e52-z8-discussion/159631-95-vs-99-octane-dyno-graph.html

You're confusing terms..

Theres

• unleaded
• premium unleaded
• super unleaded
• premium super unleaded

Premium fuels have further additives that (allegedly?) keep an engine cleaner and help prevent engine wear.

If your car - Yaris / RX8 / M3 requires superunleaded then you should run it on superunleaded. Whether you chose a premium fuel is then up to you.

If your car doesnt require superunleaded,then running it on superunleaded is a waste of money. You could however chose a premium fuel if you so wished.

motorguy

TONX wrote: »

Also provided a link to actual dyno readings, have a look when you get a chance shows a vast improvement in in torque and HP at higher RPMs. Although most people with smaller engines won't care since it's dealing with high strung NA motors.

That car should be being run on superunleaded though (97RON) at very least so showing what happens if you run it on the fuel its not expecting is a bit odd.

I really dont see the point on buying / running a performance car with a specific BHP output then running it on a lower grade fuel than is recommended by the manufacturer.

Fuel gains are neither here nor there for me. If the car requires superunleaded,it gets it.

We run our A45 on premium superunleaded, and i dont begrudge it a penny of the cost of it, nor do we scrutinize its fuel consumption. Its a performance car. It performs.

TONX_2

motorguy wrote: »

You're confusing terms..

Theres

• unleaded
• premium unleaded
• super unleaded
• premium super unleaded

Premium fuels have further additives that (allegedly?) keep an engine cleaner and help prevent engine wear.

If your car - Yaris / RX8 / M3 requires superunleaded then you should run it on superunleaded. Whether you chose a premium fuel is then up to you.

If your car doesnt require superunleaded,then running it on superunleaded is a waste of money. You could however chose a premium fuel if you so wished.

Lol I don't own the Yaris or the RX8. I'll prob be posting more pics of my car on M3 cutters so hopefully you'll see I'm not a forum troll. But only time will tell. Thanks for the info.