I second that. Of all the things to pay attention to, fuel management is a genuine imperative. There's a regulatory requirement here in Oz for the PIC to use multiple sources to establish the fuel status of the aircraft and I guess there are similar requirements world-wide. Regardless, using all the information you have in terms of dip-stick readings, fuel gauges, bowser totals and (if available) know fuel burn for the aircraft is really basic. Having and using redundant information is of course basic to verifying individual sources - such as a new or unknown dip-stick.
In the case of any light aircraft I fly regularly failure to predict, e.g. fuel needed to fill the tanks to within a couple of litres per tank, is enough to ring the alarm bells, and to cause a bit of angst while I figure out what's happened. The "that's odd" realization is important for any pilot.