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@Fox
OP your conclusion is flawed because you changed your stem and bars at the same time. This could have made you ride faster, so your experiment proves nothing. Basic rule of science: change one variable at a time.
Ed bigger tyres do equal lower rolling resistance, but the power saving of the decreased rolling resistance is dwarfed by the power loss from increased drag and the increased weight of the tyres. They will also be slower going up hills and accelerating.
In other words your 33.3c tyres are more comfortable, but still slower.