I am not one to check gas gauges often and I almost ran out of gas! It would be so helpful it there was an alarm to go along with the little light up fuel pump!
Does my 2002 Avalon have a alarm for the gas gauge? on 2002 Toyota Avalon
While i agree with you that it should have a tone alert, if any gauges are reading incorrectly or low, it is just good operator pratice to glance at the instrumentation every once in awhile! May possibly save you from getting a speeding ticket, prevent a ruined engine,......or running out of fuel!