How to Save Money on Car Rentals - A Reminder

I should have thought of this before. I let hubby make the car rental for our Reno/Lake Tahoe trip,forgetting that WHERE you rent the vehicle makes a difference in price. In many, if not all cases (?), it costs more to rent on-site at the airports, than at off-site locations. We were reminded by one of the local Avis reps in Reno, when you rent at the airport locations, extra charges are added on for "convenience" factors, like airport vendors. Somehow, these conveniences end up being paid for by us, the travelers, when we rent vehicles at airport locations. Amazingly disgusting! We could have saved about $200, by renting with Avis off-site. Another lesson learned!