Quote:
Originally Posted by BMWfan73
How much of an improvement can I expect (roughly) to see from making a long highway miles only drive (several hundred) cruising in eco-mode compared to normal? Trying to calculate fuel stops/pricing prior to the upcoming trip. Does eco on the highway make that much of a difference?
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If you use cruise control it will likely dull the amount of acceleration as you go up and down hills, which would help. It will also run the engine a few degrees hotter which reduces frictional losses. If you don't use cruise control, it allows "sailing" (basically trans disconnects engine from drivetrain, rpms drop to idle) to coast down hills for a longer distance before you need to throttle up to continue at speed. But realistically it's probably less than 10% improvement overall.