[Johnnie]

There has been some talk about the accurancy of the EVIC fuel consumption reading. I've been calculating my real consumption for some time now (using form: litres needed for full tank / distance traveled x 100) and here are the results:
(I also did MPG conversions for you US folks, manually, although it took me 40 minutes or so... :zzz

date _ _ _ _ litres per 100 kilometers
17.3.2010: EVIC 9,5 (24.76 MPG) - calculated 9,3 (25.29 MPG)
12.4.2010: EVIC 10,0 (23.52 MPG) - calculated 10,7 (21.98 MPG)
23.4.2010: EVIC 10,0 (23.52 MPG) - calculated 10,1 (23.28 MPG)
8.5.2010: EVIC 9,4 (25.02 MPG) - calculated 10,0 (23.52 MPG)
26.5.2010: EVIC 10,0 (23.52 MPG) - calculated 9,7 (24.25 MPG)
31.5.2010: EVIC 9,0 (26.13 MPG) - calculated 9,2 (25.56 MPG)
16.6.2010: EVIC 10,8 (21.78 MPG) - calculated 10,7 (21.98 MPG)
19.6.2010: EVIC 9,9 (23.76 MPG) - calculated 9,7 (24.25 MPG)
8.7.2010: EVIC 9,0 (26.13 MPG) - calculated 9,0 (26.13 MPG)
9.7.2010: EVIC 9,7 (24.25 MPG) - calculated 9,6 (24.50 MPG)
14.7.2010: EVIC 9,8 (24.00 MPG) - calculated 9,6 (24.50 MPG)
24.7.2010: EVIC 10,3 (22.83 MPG) - calculated 10,3 (22.83 MPG)
15.8.2010: EVIC 9,2 (25.56 MPG) - calculated 9,5 (24.76 MPG)
20.8.2010: EVIC 9,2 (25.56 MPG) - calculated 9,2 (25.56 MPG)
21.8.2010: EVIC 8,8 (26.72 MPG) - calculated 8,3 (28.33 MPG)
24.8.2010: EVIC 8,1 (29.03 MPG) - calculated 8,4 (28.00 MPG)
12.10.2010: EVIC 9,4 (25.02 MPG) - calculated 9,5 (24.76 MPG)
29.10.2010: EVIC 11,2 (21.00 MPG) - calculated 11,3 (20.81 MPG)
1.11.2010: EVIC 8,8 (26.72 MPG) - calculated 9,2 (25.56 MPG)
26.11.2010: EVIC 14,0 (16.80 MPG) - calculated 14,2 (16.56 MPG)
3.12.2010: EVIC 10,1 (23.28 MPG) - calculated 10,6 (22.19 MPG)
8.12.2010: EVIC 9,1 (25.84 MPG) - calculated 9,3 (25.29 MPG)
21.12.2010: EVIC 12,9 (18.23 MPG) - calculated 13,9 (16.92 MPG)
25.12.2010: EVIC 9,8 (24.00 MPG) - calculated 10,1 (23.28 MPG)
4.1.2011: EVIC 11,4 (20.63 MPG) - calculated 11,9 (19.76 MPG)
23.1.2011: EVIC 9,9 (23.76 MPG) - calculated 10,0 (23.52 MPG)
1.2.2011: EVIC 13,5 (17.42 MPG) - calculated 14,3 (16.45 MPG)
11.2.2011: EVIC 12,6 (18.66 MPG) - calculated 13,0 (18.09 MPG)
18.2.2011: EVIC 10,5 (22.40 MPG) - calculated 12,6 (18.66 MPG)
20.2.2011: EVIC 9,8 (24.00 MPG) - calculated 10,1 (23.28 MPG)
3.3.2011: EVIC 13,1 (17.95 MPG) - calculated 13,6 (17.29 MPG)

(I don't know if there already was a thread like this, if so, I apologize.)

 

[jepstr67]

Looks quite close most of the time. Some higher some lower.

Did you calculate and average deviation.....

 

[Afmcronnie]

I think the EVIC calculates your avg at the time you are looking at. If you do alot of city driving, then drive 20 highway miles and stop to fill up, its going to give you a different avg because its ticking upward. I think the longer you go between resets of the EVIC reading, the more accurate it will be. Try what Jepstr67 suggests, avg out the deviation and then go TWO fillups between resets and see if the deviation trends down.

 

[Ignatz]

Your figures look pretty consistent with each other. Some of the deviation could just be the angle of the vehicle at the pump. Ignatz doesn't have EVIC, but my Bravadas EVIC always showed higher economy than reality. Choked on highway showing 40 miles left on tank! And my Pat always beats the sticker figures.