Yeah, I've been there - used to fly an IFR-equipped LongRanger in UK that took about 1.5 passengers when full of fuel, and no amount of telling the Boss would convince him that you couldn't take off with 6 pax at Battersea with all their Xmas shopping until you pulled 100% and didn't get anywhere.
Used to cause great amusement amongst the ground staff.
Phil
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CARs in Plain English?
You bet!
www.electrocution.com/aviation