Lean burn (AFAIK) isn't the most efficient condition for you engine, high load is. Trying to stay in LB even in situations where high load was actually called for is working against you.
LB is only a crutch intended to compensate for the fact that the engine is mostly run with low load, it is not a reason to avoid high load.
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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)
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