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E5, E10 or Super, what to put in the tank.


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My dealer told me that I should use super petrol as the UX250h will also run on E10 but you get a better fuel consumption if you tank super. 

Does anybody have any experience here or information from Lexus?  

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Do not know what they put in gasoline. Here we have 95 octane and 98 octane. Between these 2 there is no difference in consumption and difference in price is also close to not really existing. Tried 95 a month and had 6.2L/100km. Use 98 and consumption is very different: 6.2L/100km.

Maybe the bigger motor is different? Doubt it.

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Hi Ej ... naturally enough consumption much depends on how you drive but come the Autumn here in the UK your choice will probably be reduced to E5 or E10 as the former will become the new 'Super'. 😉

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1 hour ago, Sundance said:

Hi Ej ... naturally enough consumption much depends on how you drive but come the Autumn here in the UK your choice will probably be reduced to E5 or E10 as the former will become the new 'Super'. 😉

Do you know how the octane numbers in E5 and E10 are?

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6 hours ago, Sundance said:

Hi Ej ... naturally enough consumption much depends on how you drive but come the Autumn here in the UK your choice will probably be reduced to E5 or E10 as the former will become the new 'Super'. 😉

sure, but the dealer said it is more efficient with super. 

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2 hours ago, ChangeAgent said:

sure, but the dealer said it is more efficient with super. 

I got same consumption with 95 and 98 so they probably are E10 and E5.

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9 hours ago, Las Palmas said:

Do you know how the octane numbers in E5 and E10 are?

The estimated difference in economy is a likely to be a mere 1% as suggested here ...

https://www.gov.uk/guidance/e10-petrol-explained

The octane difference will depend upon how the ethanol is blended and apparently could vary from Country to Country.

So as a rough guide you can expect E10 to be circa 94/95 octane and E5 to be nearer 98/99 octane.

 

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If I can't notice a difference between the types of fuel in my GSF, your not going to notice it in a UX. Just to standard. 💪

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10 hours ago, Las Palmas said:

I got same consumption with 95 and 98 so they probably are E10 and E5.

Thanks, good info.  Did you Lexus run quieter or the likes?

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8 hours ago, Sundance said:

The estimated difference in economy is a likely to be a mere 1% as suggested here ...

https://www.gov.uk/guidance/e10-petrol-explained

The octane difference will depend upon how the ethanol is blended and apparently could vary from Country to Country.

So as a rough guide you can expect E10 to be circa 94/95 octane and E5 to be nearer 98/99 octane.

 

Thanks Sundance.  I knew that on different days or different brands the Ethanol levels vary.  But good to hear about the Octane levels I did not know this. 

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7 hours ago, Arnett said:

If I can't notice a difference between the types of fuel in my GSF, your not going to notice it in a UX. Just to standard. 💪

thanks.  good to see so many of you have checked real life reality as to consumption. 

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51 minutes ago, ChangeAgent said:

 

Thanks, good info.  Did you Lexus run quieter or the likes?

No difference.

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If you think the choice of petrol is confusing now there were four grades going back some years.

2, 3, 4 and 5 Star ranging from 91 to 101 octane and all leaded of course.

I remember the company I began working for in the mid 1970s had their own pump in the yard for the vans and managers’ cars, a mixture of Ford Escorts, Morris Marinas, Escort Estates, Vauxhall Chevannes and the boss’s Mark IV Cortina. They ran them all on the cheapest 2 Star and the engines used to constantly “pink” due to the fuel grade.

At petrol stations you remained in the car while the “Attendant” put in the petrol, took the money and brought back your change.

At around 3s/6d (17.5p) per gallon you could then fill an average car for less than a pound plus don’t forget those “Green Shield Stamps” 

29FEE7DB-2227-4104-8856-EFFAA81B79EF.jpeg

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28 minutes ago, ChangeAgent said:

ah my first gallon was 3s/2d.  those where the days. 

Holie Molies Ej, when was that ... 1950s?  What were you driving then?

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1 hour ago, Sundance said:

Holie Molies Ej, when was that ... 1950s?  What were you driving then?

1950: Just learned to ride 2 wheel bike.

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I thought the only difference between e5 and e10 fuel is the amount of bioethanol in the fuel. I think the 5 and 10 refer to the % of bioethanol in the fuel. Theoretically I would think it should be possible to have 95/98/99 Octane in either e5 or e10.

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7 hours ago, paulrnx said:

I thought the only difference between e5 and e10 fuel is the amount of bioethanol in the fuel. I think the 5 and 10 refer to the % of bioethanol in the fuel. Theoretically I would think it should be possible to have 95/98/99 Octane in either e5 or e10.

I think so too.

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10 hours ago, paulrnx said:

I thought the only difference between e5 and e10 fuel is the amount of bioethanol in the fuel. I think the 5 and 10 refer to the % of bioethanol in the fuel. Theoretically I would think it should be possible to have 95/98/99 Octane in either e5 or e10.

Agreed.  So at slight variance to my own post on Weds my understanding is that renewable ethanol can be blended with any octane of petrol and because ethanol itself has an even higher octane rating the octane level of the resulting 'blend' could therefore be higher than before the blend.

However, the fact remains that it is the percentage of ethanol within the resulting mix that determines whether or not it is good for your engine rather than the octane rating.

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I’m pretty sure that petrol was a lot less than a £1 a gallon when I first started driving. I keep thinking I could buy more than a gallon for 50p in 1980 but this might be poor memory on my part 😀

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