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The second part is that the above was the first part. Vehicle mods come AFTER vehicle use optimization.
One already has records. Has eliminated the easily changed bad habits. Has already seen a percentage drop in annual fuel consumption (extrapolated that). Has updated service with a schedule.
Most of all, one no longer uses the brakes, or idles the engine.
Not until this is done can any cost::benefit apply to vehicle changes.
(With the exception of a feedback device such as Ultragauge).
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