Maybe i can see better fuel economy because used 95 RON gasoline has this rating only printed on pump and in reality much lower then 95, and by adding 98 RON to this crap i simple get normal minimum recomended fuel that not compromise engine performance.
An old quote but still relevant to emp's query (IMO)
I think the 95RON standard is always maintained. But ethanol is less volatile than petrol in cold weather so they do sometimes drop the percentage of ethanol in the petrol below the claimed E number in the winter. But sold as normal. For instance petrol sold as E10 (10% ethanol) may actually be E5 (5%) in winter so engines runs slightly better on a cold start. And E5 might be E0. (A bit like diesel is refined to a different specification in winter months but not always claimed to be winter diesel at the pump)
They may not bother changing E10 but they do drop the Ethanol percentage in the winter in cold countries which sometimes sell higher E percentages.
I always use E10 when available. When I occasionally add maybe 25 -30 litres of E5 to the remaining 10 -15 litres E10 I admit it may be just possible to imagine the engine might be very slightly quieter, and fuel consumption a tiny bit better . . But not enough for me to justify the extra cost, or have any concerns about using E10. Unless I can get the Homer Simpson price. Its heading that way
I suggest you try the occasional tank of E5 and decide for yourself whether you detect any difference, or enough to justify the extra cost. Or try one of the advanced premium options such as shell V power . The results and smooth running of the car may vary anyway depending on brand and location. In some areas various brands all come from the same oil refinery. And the difference between E5 and E10 may differ depending on whether its summer or winter.
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