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Justjohn is right. You also need a warm engine, mostly level road, no strong headwind and an o2 sensor that works properly. Immediately after accelerating to your cruising speed ( below about 65 mph ) you should feel a point where you need more throttle to maintain speed , this is leanbun. You may feel a bit of a stumble just before this happens. After in leanburn if you give it too much throttle, and the car feels it very suddenly gained 20 hp you have lost leanburn. I have some lights and and Mpguino that tells me all this but you don't really need anything at all IF eveything is working as it should . Hope this helps
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