That was Georges comment, not mine.  Fwiw..



________________________________
From: Will Owen <[email protected]>
To: alfa <[email protected]>
Sent: Tue, November 10, 2009 7:52:17 PM
Subject: [alfa] Re: Speedo check

Brian Shorey reports:

"OK, My GTV-6 speedo says 80 MPH @ ~3600 RPM which is consistent with the 22.14 
MPH/1000 rpm (which is what the specs on the GTV-6 says as well). BUT my GPS 
receiver tells me that when my speedo says that I am doing 80 MPH, and the tach 
says ~3600 rpm, I'm actually doing only 72 MPH."


Inneresting. My Milano ('87 Gold) has not had a working speedometer for ten 
years, as of this very weekend (no celebrations planned), so for all this time 
I've been using the tach as my speedo. Second through fourth gears I figured 
out by driving past one of those radar trailers the cops set up so you'll see 
how badly you're speeding and be shamed into slowing down. I'd come up with 10, 
14 and 18 mph/1K respectively. I remembered my old Berlina was geared exactly 
like that, and that its fifth gear was pretty much 22 per thou, so I assumed 
this was the same, and drove accordingly, including across the country. Lately 
I've been using my Garmin as my speedo in that car, and have discovered that 
the speeds are more like 10, 15, 20 and 24! Doesn't seem like such a big 
difference, but while 66 mph on the Interstate is always OK, just-shy-of-75 
often is not... and that 75 I thought I was driving around here is a tad over 
80.

Unless you've got a stump-puller ratio in your car, Brian, I'd think twice 
about taking your GPS's word for it!

Will Owen
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