Well, actual weight would have an influence as well, so if someone wanted high precision of the calibration, there are a number of things to consider.
Most modern EFIS fuel level indicators have a resolution in increments of single gallons. I have never tested it but my guess would be that the AOA variable induced by weight change and cruise speed would not be any more than 1 gallon.
I personally never rely exclusively on a fuel level indicator for fuel decisions to the point where a 1 gallon difference in indicated value would be important to me.
Ground attitude vs level flight attitude can make quite a bit of difference (particularly in a tail dragger) which is why many of the modern EFIS systems have dual calibration tables and the ground one is used for the displayed values until the EFIS detects the aircraft is in flight.