Lower than expected final ABV from kits

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Bertiebert

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Sep 24, 2024
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Stoke on Trent
Hi, please somebody tell me I'm wrong here.
I've done three beer kits thus far. Each one has an advertised ABV between 4.3 -4.7% yet I've had to add sugars each time to get anywhere close to this.
The latest kit is a Saint Peter's ruby, it's advertised but 4.3 ABV. Once I thoroughly mixed the wart I took a gravity reading. It was very low, around 1.035. now if this was to ferment down to 0.000 (I know it can't) it would give about 4.5% ABV. If we assume it ferments down to 0.010 it would only yield 3.3%ABV. If my calculations are correct this is considerably less than the advertised 4.3%?
Anyway I've ended up adding 500 grams of dextrose to bring the ABV up to 0.044. If this ferments down to the given 0.010 it should give me a beer of 4.5% right?
If I'm right why is the ABV on the kit so low?
If I'm wrong then please somebody put me right.
Thanks,
😵‍💫
 
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