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I understand that today the signal processing in cars is all digital.
But the displays can be an analog meter.
The article I quoted uses an analog meter to display that goes from 0 to 10 and he programmed his system to calibrate it so it is the MPG value divided by 10.
So, the pointer on 3 on the display means 30 MPG.
Seems to me that once you get used to the quirks of your own driving, it only takes a quick glance at the analog display to understand what your result is.
A digital value like 31.7 MPG probably distracts you because your brain wants to interpret the numbers.
I find that I look at the (analog) tachometer more than the (analog) speedometer, because I know the relationship ( engine speed vs vehicle speed) very well, even though the signal processing is digital .
And in any case I don't think the difference between, say 31.7 MPG and 33.4 MPG on a digital display, in most driving circumstance will mean all that much.
When specifically testing - that's a whole different driving scenario.
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