Nellyb84

I bought my 2015 A3 in December 2014. For the first several months, if I really topped off my tank, the total mileage available would be 400. In the last 6 months, I have noticed it has been more like 375.

Is this just due to warmer temperatures lately? Anyone else notice this?

Timgo2003

When I am on long trips and driving steady speeds on highway it will read up to 420 miles on a fill up. In town driving will result in 360 to 380 miles on a fill up. I think it really depends on how you have been driving in the immediate past. This is with the 2.0T

sethroid

TSB 171449 addresses this topic:

The range is calculated using an internal weighted value. Two different calculation methods (filter algorithms) are used for determining the range display.

For vehicles older than model year 2009:
Only consumption figures of the last 50 kilometers (31 miles) are included in the calculation. The last kilometer has the most weight and the first kilometer has the lowest. If the vehicle is driven efficiently right before the vehicle is refueled, the displayed vehicle range could be much higher than it was after the previous fill-up. Conversely, if the vehicle is driven aggressively right before the vehicle is refueled, the displayed vehicle range could be much lower than it was after the previous fill-up

For vehicles from model year 2009 and newer:
A gradual driving profile is built from the last 50 kilometers (31 miles) and from the last 500 kilometers (310 miles). The short-term consumption figures over the last 50 kilometers (31 miles) and the long-term figures over 500 kilometers (310 miles) are included in the calculation, which is also based on the tank volume. With this method, the range display can only rise when the vehicle is driven efficiently for extended periods, resulting in a more accurate vehicle range.

Tip: In both methods, the range display after fill-up depends on the driving style before fill-up, so the range displayed after fill-up will not always be the same. In addition, the displayed vehicle range does not refer to the whole tank volume; it only indicates a trend based on the short-term to medium-term fuel consumption.