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Getting a digital read out of your mpg is going to be quite a challenge.
How about an analog reading of your relative fuel use. A gauge needle that reacts to changes in net fuel flow.
A flow meter in the source and return lines.
The gauge starts at zero.
The fuel source flow meter turns the needle one direction.
The fuel return flow meter turns the face of the gauge in the same direction.
When there is a difference in the two flow rates the needle will move relative to the face of the gauge.
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Greg
2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
1996 E300D 351k, 177k on WVO
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