As @No.3 said you have to find the sweet spot. Only good way to check FE perfectly is tank full to tank full and then manually calculate or download som app. What I have seen trip computers usually exaggerate the numbers. Apart from that invest in a TPMS (Tyre pressure monitoring system) if your vehicle doesn't have it. It was pretty cheap from Aliexpress and likes. Helps keeping eye on each tyre.
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