I'm using E85 and regular petrol mixture in my 1.7 8V regulary without conversion.
- using of Ethanol / Ethanol&Petrol mixture lowers CO, CO2, and HC emission, you may pass the MOT test
even with a dead cat. converter
- higher RON number, 105 instead of 95
- i'm experienced smoother idle, and better torque at the low end
- extends the lifespan of lambda sensor and cat. converter because of the clean burn
- most of the lambda equipped injection systems are able to compensate the AFR without any
modifications if the quantity in the tank not exceeds the quantity of the petrol
- good cleaning effect keeps the injector heads clean
- ethanol has a lower energy content compared to petrol, that's why more ethanol needs to be injected
into the engine to achieve the same engine power. That's lowering the MPG up to 30 percent.
- in some cases difficulties at cold starting, lean running (mainly in the warmup phase).
- Ethanol is hygroscopic, it can cause corrosion if water is present in the fuel system. (Only when the vehicle
is unused for longer periods)
- Ethanol slightly speeds up the wear of the pure copper parts.
Here in Hungary the price of the complete set (externally programmable contol unit + wires and connectors) is
arounf 175 GBP. The unit must be connected between the injectors and the original ECU, and it needs a coolant
temperature signal. With the connectors provided the original wire loom remains unharmed.
ps: you mentioned E10 which is the regular petrol (the companies using ethanol to increase the RON),
there's E100 exists, mainly is Sweden, that's pure (Bio)ethanol.