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Hi SIFLIGINIUS. I don't think your question is particularly relevant for this forum, but I will attempt an answer. If your gauge readout is analogue, with a moving needle, then you don't need to "convert the voltage" at all. Just print a new scale for the gauge and stick it on top of the...

By the way, I think the Calculated Load Value could be a more accurate measure of fuel consumption on diesels. According to ISO 15031-5 (equivalent to SAE J1979), for petrol (gas) engines the CLV is effectively (current airflow / peak airflow), and as reidh pointed out, the air-fuel ratio is...

So how do after-market trip computers like the ScanGauge calculate fuel consumption? The ScanGauge web-site says that 99% of cars and light trucks report information on fuel consumption. So I presume they are using generic OBD data. But what PIDs and what algorithm? And given the variations...

Thanks for the feedback. I'm looking for a fuel consumption metric that will work for petrol (spark-ignition) and diesel (compression-ignition) engines using only generic OBD2. What about PID $04 - Calculated Load Value? This is returned as a percentage. Any better suggestions?

The consensus seems to be that measuring the on-time of the fuel injectors is the way to go. But how to do that? As far as I know, the injector timing isn't available over OBD2 (EOBD). An alternative approach I have seen is based on the fact that: Fuel Flow = Air Flow / Stoichiometric...