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Now with some distance to this project I think of the "engine split" as one way of three possible ways to reduce fuel consumption almost the same way. The other two "similar" methods is to reduce gearing/engine rev and to perform "pulse & glide-driving". In all thre cases an oversized engine is operating at a higher combustion pressure than normal near maximum torque for most of the time its running. Having extra power when needed is definitely nice in some situations so the "engine split" as a way to save fuel only is the worst method of the three. But as a desperate repair it´s a nice comfort that it also save a lot of fuel.
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