There's a much easier way to improve MPG that is guaranteed to work: stop buying heavy 2+tonne vehicles with 3+litre engines, and try walking, a push-bike or public transport instead of taking the car every time.
I already get 50MPG in my (diesel) vehicle, which is about twice that on the news articles even after the so called improvements, and I don't use it except when I need to. I think I'll manage without any magic pills!
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