I have noticed issues with fuel gauges in Aussie LS2s. They may have the same operating system ute to sedan - but the gauge can indicate wrong after a tune. It can either stay up high too long or say that its empty very quickly when it still have plenty.
I am wondering about the cause and also the way to fix it.
Both issues have occurred after a base tune was used rather than a remodelled tune that was read from the actual car.