California fuel gauge fault NOT

Hi everyone,
I thought that I would share my story of angst and worry this morning, i fired up the Cali and rolled her out of the garage for the first time in many months.
So as usual key in turn on wait (and pray) for all greens and fire up, so i preceded out for a lovely drive, i went up to the next city from Manchester up to Liverpool and then pooled round, it was on my way home that i noticed the fuel gage had not moved from full - strange i thought so i proceeded home and did a mileage tot up i had just done 120 miles. The fuel gauge was full and my range was 283miles what was going on?
The fuel gage was still showing full bars - impossible i thought so then all sorts started going through my head should i do a hard reset ? Should i find the fuel sender cable and disconnect it? Should i go to Ferrari ?
I decided on going to the fuel station and fill her back up to see what i had used (i always put her away full of fuel) so I’m on my way to the fuel station and going over potholes purposely trying to see if i had a sticking fuel sender but no still full bars I’m starting to panic now at the thought of another £x000’s bill coming my way from the Ferrari main dealer.
So I’m now 2 miles from the fuel station and mother of all mercies the fuel gauge drops 1 bar HOORAY!!!
Finally 126 miles i get to the fuel station fill up and WOW i can only get 15.2 Litres of fuel in the car
I do the math and realised that i had been taking my trip very steady and staying within the limits of the law which to be honest is not really me
36 miles to the gallon I am stunned my DD a Porsche turbo cannot and has not ever return that amount of fuel economy.
So panic over life is restored to normal, now just what am i going to do with the money that i had already spent in my head on fixing this non event

Cheers Andrew