UPS Rate and Surcharges

Greetings,
I have searched but cannot resolve this.
Zen UPS rates are different the posted UPS.com rate.
ie.
ship 4.0 lbs from 77054 to 91025
Zen = 8.94
UPS = 9.91

Any ideas?

Thanks in advance,
--gd

Info:
Zen 1.3.8a
Tares set to 0:0
Country of origin United States
Postal code 77019
UPS Pickup Method =RDP
UPS Packaging? =CP
Residential Delivery? =RES
Handling Fee =0
Tax Class =--none--
Tax Basis =Shipping
Shipping Zone =--none--
Sort order of display. =0

Debug via email from UPS:
UPSOnLine4%1DM%77054%US%91025%US%106%4%101.35%0.00%101.35% 8:00 A.M.% 4%1DA%77054%US%91025%US%106%4%63.01%0.00%63.01%10:30 A.M.% 4%1DP%77054%US%91025%US%136%4%57.57%0.00%57.57%End of Day% 4%2DA%77054%US%91025%US%206%4%28.31%0.00%28.31%End of Day% 4%3DS%77054%US%91025%US%306%4%20.91%0.00%20.91%End of Day% 4%GND%77054%US%91025%US%006%4%8.94%0.00%8.94%End of Day%