in most cases 5% – 10% more. So any gains made on ‘cheaper’ fuel will almost certainly be wiped out by having to use more of it.
5%-10% is nonsense. Try 1%-3%. From zero ethanol content to E10, not from E5 to E10. Ethanol carries 34% less energy than pure petrol. That means running purely on ethanol increases your consumption by 34%.
You will not notice a difference between normal petrol and E10. The difference between “pure” petrol and E85 is around 23% increased consumption. That’s from zero ethanol to 85% ethanol.
Second, it’s not about “cheaper”. It’s about “stretching resources” and reducing emissions.
Prior: SEAT Ateca Xcellence Lux 1.5 TSI DSG MY19, VW Golf GTE PHEV DSG MY23
Current: Hyundai Ioniq 6 Ultimate
Next: we'll see what's available in 2028.