This is a discussion on Fuel/Mileage Computer inaccuracies within the CLA General Discussion forums, part of the Mercedes-Benz CLA Forum category; Originally Posted by Capt Torch The 10% difference measured can be the cause of temperature difference of the fuel and outside temperature, The fuel measurement ...
2015 CLA Jupiter Red, premium,multi media, driver assistance, sport packages. walnut dash, Bi-xenon lights, and ambient lights, delivery, 12/14.
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Well, I don't think it's that serious here as the data presented by the dash computer is only for the driver. It's kind of a feel good factor to those who are environmentally conscious. However and as you said, the systematic error is significant enough for some drivers in their choice of vehicle and engine.
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Two points. first, if the gauge is usually wrong, why is it always a high estimate?
Secondly, we expect more from MB, the best or nothing at all.
However! As mentioned thats just a gauge ... real world miles driven per full tank is more objective and 38mpg or 6.2L/100km is lofty but possible on a flat stretch at constant nominal speed (eg 65mph) which is a balance between air drag and inherent momentum.