![]() In normal use this can be expected to be of the order of ten percent, but with care may be pushed up to well in excess of fifteen percent and if the fuel consumption / engine speed graph were linear, a comparative steady speed test should give twenty eight percent saving - but of course life does not consist of linear graphs and steady state conditions!Ī less immediately obvious benefit is the potential engine and transmission wear reduction. Probably the most obvious of these is the fuel saving. If an overdrive is used to reduce engine revolutions when cruising speed has been attained in top gear, the benefits are numerous. Indeed, with some cars being equipped with more engine power than stopping ability it may even be dangerous to misuse it in this way. ![]() An Overdrive may be most easily described as an extra, or normally fifth, gear, and although it may technically be used to make a vehicle go faster, that does not realise its correct potential.
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