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Re: RPM=MPG? (Justifying OD)

To: Stuart MacMillan <macmillan@home.com>
Subject: Re: RPM=MPG? (Justifying OD)
From: Tab Julius <tab@penworks.com>
Date: Mon, 17 Jul 2000 12:58:59 -0400
I'll have to ask about a warranty, though these guys have a good rep to 
begin with (granted, the tranny may be unknown, don't know if they rebuilt 
it or not).

I may well do it just to get rid of the vibration, and figure I can perhaps 
eliminate upgrading the stereo to be heard over the engine, but after 
today's drive I was thinking I was going through a lot of gas, and it ain't 
cheap (or as cheap) any more, and so I was wondering if I could start 
saving a couple of gallons a trip via OD, and if that might not be the 
added incentive to move it from a "nice to have" to a "cost-justified" status.

Thanks for the feedback

- Tab

At 09:56 AM 7/17/00 -0700, Stuart MacMillan wrote:
>Tab,
>
>You will get a slight increase in gas mileage, but just because the
>engine is spinning 18% slower does not mean you will get 18% better gas
>mileage.  More like 2% or so, because the engine is still putting out
>the same amount of power (i.e., "work") to move the car at the same
>speed, just doing it at a slightly more efficient part of the power
>curve.
>
>The primary value of the overdrive IMHO is the reduced noise level at
>road speed, which it does rather well.  You will also get more miles out
>of the engine, maybe even the 18% more you were hoping to get on your
>gas mileage!  With your commute the relative peace and quiet are
>justification alone, and $1200 for an OD tranny including installation
>is a pretty good deal!  Is there any warranty on it?
>
>--
>Stuart MacMillan
>Seattle
>
>'84 Vanagon Westfalia
>'65 MGB (Driven since 1969)
>'74 MGB GT (Restoring)
>
>Assisting on Restoration:
>'72 MGB GT (Daughter's)
>'64 MGB (Son's)
>
>Parts cars:
>'68 & '73 MGB, '67 MGB GT



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