If you are showing 91 miles for 50% that's 182 miles for 100%. The long range S5 has a usable battery of around 62 KWh so dividing 182/82 gives 2.94 miles per KWh.
Have a look at your accumulated trip meter and see what average m/kwh it is showing. My guess is that it will be somewhere close to 2.94. You said 91 miles with aircon on. I suggest you turn off aircon, put in normal mode and repeat the above calculation.
 
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