I think my hydrometer is way off to put it mildly. its reading my tap water at 1.08 at 77* which when corrected would actually mean 1.10. Should I not sweat it because it's going to also be off by a similar amount when I check my final gravity? I'm new to this and I'm also trying to get a feel for my efficiency and I keep getting low numbers like 66% efficiency but if I add back that difference it brings my efficiency up to almost 80%.