I have a ScanGauge II on my 2000 Jetta TDI and it does a reasonably good job of estimating the fuel consumption. Not perfect, but good enough to know how well I did on a commute or an errand. I normally run B20, and when I change to pure dino-diesel, the SG will get confused and will be off by a several MPGs. You can check out my fuel log; I've started to include the SG results with each fillup.
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Last edited by NachtRitter; 05-22-2013 at 02:27 AM..
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