I'd like to second Lorn's post below about installing/using a fuel flow
"totalizer." 

...What (Bryan) should do is install a fuel flow instrument. With fuel flow,

you will not only know, much more accurately, how much fuel that you  
have. You will know how much longer you can fly. Fuel flow instruments  
are much more accurate than gauges and the install would be in the  
engine compartment (and panel) and not in the fuel tanks...

I have an Electronics International MVP-50 in my IV-P and it consistently
measures fuel consumed within 1% of actual. (Total capacity minus fuel
required to refill equals actual fuel consumed--any discrepancy this and
what you added during refuel means an error in the flow totalizer--usually
very small; and most systems can be calibrated.) You have to verify this by
starting with full tanks and refueling to full again after a flight, but as
with Lorn, I've found my totalizer function to be more accurate than the
quantity gauges. EI's MVP-50 is a complete aircraft/engine monitoring
system, but they also make stand alone fuel flow/totalizers, as do others.

Hope this helps.

BOB




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