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From: "Jim Wilkins" <muratlanne@gmail.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: O/T - diesel car - "modern" car why extra 30+percent fuel consumption?
Date: Wed, 1 Jun 2022 11:55:28 -0400
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"Joe Gwinn"  wrote in message 
news:oere9h1jttrhl4f80k9k73nbpe0i8130ti@4ax.com...

On Wed, 1 Jun 2022 00:07:52 -0400, Mighty Wannabe
<👩ðŸ?½â€?âš•ï¸?👨â€?âš•ï¸?👮👨ðŸ?¿â€?🚒👷@ðŸ?».ðŸ??🎖ï¸?>
wrote:

>Joe Gwinn wrote on 5/31/2022 4:26 PM:
>> On Tue, 31 May 2022 14:14:14 -0400, Mighty Wannabe
>> wrote:
>>
>>> Joe Gwinn wrote on 5/31/2022 1:01 PM:
[snip]
>>> My portable GPS unit is definitely correct because the speed from that
>>> portable GPS unit always corroborates with the speedometer readings in
>>> all the vehicles I have driven.
>> The standard calibration approach is to use measured one-mile markers
>> on selected highways.  No electronics involved, so clean and direct.
>>
>> Joe Gwinn
>
>You'll have to use a stopwatch to time it, then calculate the mile per
>second, then convert to mile per hour. That will be a really tedious
>task if you don't use a calculator. So you are wrong. Electronics will
>be involved.

Umm, not so fast.  Simply check that the car's odometer shows the same
number of miles traveled as the highway mile-markers indicate.  No
stopwatch or calculator needed, mechanical or electronic.

Joe Gwinn

---------------------------------
The odometer is mechanically coupled to the wheels but an analog speedometer 
isn't, and they may not agree.
https://www.howacarworks.com/accessories/how-a-speedo-works