Agreed 
. I think zwift must use a cda number that is a rediculous riding position. They need to adjust it a little to a more real world scenario for the avg rider. Maybe they can add a feature to their phone app where we can put the phone in our jersey pocket and it will measure our upper body angle.
But that’s been exactly my point. When we talk zwift distance, we have to nit pick and talk about small adjustments that need to be made here and there. And zwifts calculation is consistent as its based off their equation.
TR’s number is based off flywheel speed from what I hear. This is both both not consistent and can be wildly inaccurate.
Its sort of like power meters. I want my power meter to be accurate to 1%, but I dont need it to be. But I absolutely need it to be consistent. And not wildly inaccurate.
For the record, I do ride by hours, not distance. But like you mentioned seeing my miles rack up is a good motivator.