This is something that can be annoying with Avis' (and sister company Budget) website. I would recommend checking your Avis Preferred profile to see if it's set to add any options like GPS or insurance.

If that's not the case, try booking both with and without logging in and inspecting the pricing section and see if the base rate is going up when logged in, or whether it's some other line item in the taxes and fees section.

Lastly, you can just book with your preferred AWD when you're logged in at Avis and then enter it for tracking on AutoSlash. Our system should find the lower rate. It's possible you will be able to re-book with us at the lower rate and bypass the annoying Avis.com pricing bug. Note that there is a place on the checkout screen when you book though us to enter your Avis Preferred member number.