Some USPS rates estimate wrong

[eruns]

After I enabled USPS shipping method with
EXPRESS
PRIORITY
PARCEL

it calculates EXPRESS and PRIORITY correctly, but it gives me a much higher price and longer delivery period on PARCEL POST , compared to the USPS web tools site calculator.

Anybody experienced that and any ideas why?

[Ajeh]

Check what setting you are using for whether you are using Machinable shipments or not ...

[eruns]

Thanks, that lead me in the right direction -

I had the default value for Package Tare Small to Medium - added percentage:weight set to a number larger than 0

[Ajeh]

Thanks for the update on what you were doing wrong ...