Can you save money with a half-filled fuel tanks?

[tcal69]

i actually get more mileage when i fill my car half way compare to full tank... don't know why.....:hammerhead:

 

[Tris]

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Plus the OBC is never 100% accurate
[/quote]

+1

Once mine showed a 30 km range, 4km later im sitting on the roadside stuck for fuel

 

[Hugo_za]

Regarding the reliability of the OBC:

On my car, for instance, there is a KVA option in the hidden dashboard menu. The KVA has to do with consumption variance and how the car reports fuel economy. BMW's instructions for calculating this value is to fill the car, drive it, and then compare the calculated economy (A) vs. the OBC (B) economy. Then do the following calculation: (A/B)x1000=X. (X) would then be the actual KVA.

The 7-er was on a KVA of 1000, and since I am meticulous with fuel recording, I noticed often large differences between my calculated economy vs the OBC. I then changed the KVA to (X) based on my calculation, and my OBC vs calculated economy is now within 0.5l/100km of each other where in the past the difference could be as high as 7l/100km.

 

[Webmaster]

I'm on the other end of the scale. I drive around (mainly town) hovering above empty, filling up only when we hit the long road. I normally throw R200 in during the week. My pap 320i feels nippier with less fuel tagging along. Maybe its just me.

 

[phantom]

You need energy to move weight.With wheels that figure is reduced.For guys who travel in traffic the lower weight is a must for obvious reasons that weight has to be moved from 0 to whatever.On a level road with no traffic the difference is negligible.
There are of course other benefits that have to be considered and that is better power to weight ratio and braking efficiency. :rollsmile: