<human>: Can you succinctly summarize the text in 1-3 sentences?

I have a sweet ride, a Kia :P  Still under warranty so taking it elsewhere costs me money.

I'm 99% sure my gas gauge is broken.  It still works a bit, a 1/4 tank left = empty.  I confirmed this when one day I filled up my tank and I put in 54 litres into a 55 litre tank.  I took it in a couple weeks ago, they confirmed it was broken and they replaced a fuel sender unit that they said was "shorted out".  Since then, nothing improved (the gauge was still off after a fillup- 40 litres out of 55 and it wasn't at half).  I took it back in and they ran all these tests and basically told me I was crazy.

I asked if they drained the tank, but they scoffed at me like that was a ridiculous, impossible suggestion.

I guess I could wait until the gauge reaches 3/4, then 1/2 and then 1/4 fill up with gas and take pictures of it and the gas receipt, though that would take weeks.

I plan on running out of gas, taking a picture, and calling CAA (Canadian AAA) or possibly getting a gas can.  Is this a bad plan?
<bot>: Is running out of gas bad for my car?  Do morons believe science and math, or do they expect more?