Strange 'Range' Behavior

Huw Powell audi at
Thu Sep 11 16:03:56 PDT 2014

Copying for the OP

On 9/11/2014 8:46 AM, Dan DiBiase wrote:
> Took my A4 on it's first road trip in a while, from Central NJ to Saratoga Springs, NY and back. A function of our new car having satellite
> radio, I guess...! Anyway, was surprised at the fuel mileage - averaged 35 mpg each way - granted, it's 99% highway miles, and traffic
> was light so the cruise was set at 72 mph and hardly had to touch it. That is higher mileage than I have gotten in the past, by a couple of mpg's.
> The strange thing was the range computation. Going up, I used just under half a tank of gas so I was monitoring the range closely to see how
> far I could get before I needed to stop to ensure I didn't roll into the driveway on fumes - second half of the tank always seems to go faster
> than the first.... ;-) When I got onto the highway, the range actually went up about 10 miles, which I assumed was due to the better gas mileage
> I was getting than in the little bit of stop-and-go traffic approaching the Northway. It kept going up for a while, then starting going down, but at
> a very uneven rate, and finally sat on 235 miles for a good 20 minutes (during which time I would have driven about 24 miles). So I ended up
> pulling off and putting some gas in but didn't reset the computer. Got back on the highway and the range read 440 miles, then proceeded to
> drop about 5 miles for every 2 miles driven until it seemed to be at a 'normal' level for the fuel I had remaining in the tank - then went down
> normally at that point.
> I always assumed that the range calc was a simple 'look at the fuel level, look at the mph and compute' sort of thing and don't recall it ever
> fluctuating so much.
> Anyway, it was nice to get reconnected with the car, since it doesn't get much use now that my daughter has gone to college and her Mini
> Cooper is sitting there calling for me to drive it.... But I wish it had satellite radio....
> Dan D
> '04 A4 1.8Tq MT-6
> Central NJ USA
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