[s-cars] Cold weather and lousy fuel mileage

[Jerry Scott]

You definitely have a problem somewhere. My 93 consistently get 21 to 22 
in any weather for town driving.
Jerry

Mark Rivera wrote:

>Sorry I can't help, but you're in much better shape than I.  My bone-stock
>102K mile 93' S4 got 12.75mpg last fillup, all in-town driving, and I don't
>exactly drive to get good mileage.  Still, I would expect much better.
>
>I think 16mpg is the best I've ever gotten in my 4 months of ownership.
>
>Mark
>
>-----Original Message-----
>From: s-car-list-bounces at audifans.com
>[mailto:s-car-list-bounces at audifans.com]On Behalf Of Stott Hare
>Sent: Friday, March 09, 2007 1:13 PM
>To: s-car-list at audifans.com
>Subject: [s-cars] Cold weather and lousy fuel mileage
>
>
>Weather here in the Northeast has had the temps hovering around 0*F, and my
>fuel mileage has gone straight to the toilet.
>
>Nice weather (40*F>) and 95% highway I can pull 21mpg and around 400 per
>tank.  Cold weather and 85% highway and I watch my mileage plummet to 16mpg
>and maybe 250-300 miles a tank.  Watching the TDS1 when the outside air temp
>is an indicated 0 - 15*F  shows an intake air temp ~20-25* warmer.
>
>Patient is a 95 S6A with 252k on the clock.  Still stock.  Receives routine
>maintenance.  She plugs, oxy sensor and fuel filter were done around 204k so
>they could be considered due, but I would expect that to cause decreases
>across the board, not temp specific.  Coolant temp is rock solid at the
>first fat bar (~10 o'clock).  Multi-function temp sender was done at 204k.
>The HVAC temp sensor in the coolant line between block and heater core
>replaced about 230k.  No CEL or codes.
>
>My prior experience with the CIS cars didn't yield such temp sensitive
>performance, if you had the car tuned right and all sensors working.  Is
>this something particular to the Motronic / hot-wire MAF systems?  Is the
>incoming air so cold that the hot wire isn't?  I don't have my mixture gauge
>in at the moment, but I suppose I will hook it up this weekend and watch
>mixture over the next week.  When I had it hooked up in normal temps
>previously (within 5k), mixture behaved as expected at idle and cruise, on
>throttle and off.
>
>This just the way things are? or is this an indication of a (temp) sender or
>something that is begging for replacement.
>
>Thanks!
> -Stott
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