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this seems to have made a major difference - am going to fill up tomorrow and expect to make over 45mpg when previous average (without octane boost & bypass has been 38.6mpg, octane boost alone was 42mpg).
I'm going to develop this with an adjustable bypass. A brass Y with two valves, one feeding the bypass, one feeding TB heat and an unvalved Y piece to feed back into the cooling system. Three possible modes, heat off, 50/50, heat on. this will allow for all weather conditions here, although a thermostatic bypass would be more efficient me and electrics don't mix and I've not been able to find a suitable thermostatic valve.
I'm surprised that manufacturers aren't using adjustable intake heat, since if I'm right removing this has improved mpg by 3mpg for low/med speeds, but it's proven advantageous at prolonged high speeds.
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