If you take 10% (E10 is 10% ethanol) out of 1 ltr of fuel (you are left with 0.9ltr) instead of paying 1.30/ltr you are paying 1.45/ltr plus you lose octane on what is already 95RON fuel. Not the best use of anyone's time or money. If you want less ethanol just buy Tesco super unleaded Momentum 99 RON
The advantage is you will be limiting your bike/car to even less performance so making it even less likely you need ISA to keep your speed down
We can all look forward to 70mph limited Moto E based road bikes with air bags, as trialled in the 80's, or compulsory air bag jackets. It's not a great prospect :-(