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I own a SG2, which has a detachable cable that makes it possible to swap between cars -- though I don't think that this is easy to do. Each vehicle has to have it fuel capacity calibrated, and the speed has to calibrated as well, in order to get a reasonably accurate FE number.
But, I think you can buy 2 Ultragauges for a bit less than 1 SG2? And, two of the numbers on the display are larger size, which makes them very easy to compare the instant and the average FE. A friend bought the UG, and I think I would own it if it was available a few years ago.
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