factory instrumentation accuracy & mpg

[Derek Pulvino]

The other thing to consider, is if your previous t44 was a 5-speed, I
believe they also had a higher final drive ratio...

...and I've seen my milage gauge to generally be w/in 0.2mpg of when I've
compared to whne I've done the math at fill up times.

Do agree though, 20 is pretty low.  Recent trip to cali and back saw an
average of 24'ish mpg w/speeds ranging from 70-90 mph.

dp


Message: 5
Date: Sun, 26 Jan 2003 13:10:56 -0500
To: ben swann <benswann at comcast.net>, flyboysteve at usa.com
From: Brett Dikeman <brett at cloud9.net>
Subject: Re: re. factory instrumentation accuracy & mpg
Cc: quattro at audifans.com, 200q20v at audifans.com

At 12:24 PM -0500 1/26/03, ben swann wrote:
>Yes - peeve # 2 on the new aquisition of the '91 200 20v tq avant.  Has
>SJM chip with 2.5 bar pressure transducer AFAIK.  Gas mileage abysmal
>on the way home - 20MPG and no I was not easy on the gas and probably
>averageing over 70.  My '87 5000 tq would get an easy 28 mpg under the
>same conditions.  I thought Motronic was supposed to be superior at
>engine management, including economy, over CIS (CIS/motronic).
>
>What's up with that?

-wider(and different) tires
-several hundred pounds heavier
-flares probably don't help with airflow
-higher valvetrain resistance(probably negligible, but...)
-oil different viscosity, perhaps, that what you run?
-oh yes, and with the chip, did I mention "a lot more HP"?
Accelerating onto the highway full throttle can influence average
economy considerably if you have a chip.

Cruising on the empty highway, leaving it set on cruise control, on
the hakka Q's, I'll get about 24 tops at 75-80 indicated.  My old
5000 would do about 2mpg more, usually, same speeds.

Off cruise control, traffic for passing?  More like 22 or worse.

Keep in mind tires can play a factor here, and not just tire
pressure.  The MXV4 "Energy" for example gets a few(very few) more
MPG than the regular MXV4.  Let's also not forget elevations, wind...
:-)

Brett
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