'When tires are out of balance, they often partially lose traction with the road, increasing fuel consumption. 1 oz of imbalance at 60 mph usually causes 7.73 pounds of excess force per revolution. And for every extra 7.73 pounds, a vehicle will use an equal amount of excess fuel."
NOW for engines I don't know but 20 gms is pretty close to 28.35 gms which is 1 oz.
Sure lot of shaking going on No it's Whole lot of shaking going on.