Tell John Twist. He thinks overdrives are strictly "feel good" add-ons.
CR
Paul Hunt wrote:
> There's been quite a shift in perception since, then, and that must have
> been the view for the whole of MGB production i.e. nigh-on 20 years. From
> what I hear from that side of the pond now the common view now is that
> overdrive is a very good thing for driver comfort and for the engine. The
> fuel issue is barely mentioned, in fact it is often said that overdrive
> makes no difference to mileage. I don't believe that to be the case, by the
> very fact that the engine is turning slower and giving less bangs per mile
> and per minute you must be using less fuel, unless you have to drive with a
> larger throttle opening to maintain a given speed in OD 4th as straight 4th,
> which certainly isn't the case on any MGB I have driven. If one accepts
> that you get better mileage in 3rd and 4th, one must also accept that one
> gets around half that improvement in OD 4th compared to 4th.
>
> PaulH.
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