05-14-2019, 11:53 AM
Some manufacturers like Aprilia are helpful when the tank gets down to a certain low-level. At the predetermined low-level they know how much fuel is left and the current rate fuel is being metered out to the cylinders. Using those figures, it reports on the instrument cluster the number of kilometers (or miles) you have remaining in reserve. If you happen to throttle the engine some more, the metering rate of fuel increases and thus, your expected range remaining is adjusted down and the display updated. Conversely, if you decide to sip fuel enroute to the next gas station, your remaining range will be recalculated up. This approach is precise, sans any fuel leaks or injection problems.