LOD is roughly tied to the vertical axis on the charts. Find the LOD and RPM combination that's on the top island and try to use that. It's usually somewhere around 2000 rpm and 75% load.
LOD is calculated from the quantity of air flowing through the engine. Only a certain amount of air can pump through a specific engine size, so you can compare what IS going through to what COULD go through. There's a specific ideal ratio of air to fuel for a good burn, so from that you can calculate how much fuel is going through.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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