Deliveries to Black Mesa

It's 670 miles from Denver to Black Mesa, AZ so how did The Denver Post travel to Gramp?

He would have, most likely, received it through the mail.  By the 1930s, places like Black Mesa would have received newspapers from parcel post service and/or rural free delivery, two services available from USPS. Although I haven't been able to pin down any definitive statistics, it would have likely taken 2-5 business days for the paper to get to Black Mesa from Denver.  The time of year would have made it easier, as the Colorado winters would have prevented the postal service from going from Denver over the mountains to Black Mesa with any haste. I wonder--because they were a filling station, they would have probably also sold newspapers, no?

Another question, however, is how and how often did the petrol get to the Filling Station? There weren't pipelines at the time and the petrol company would have had to deliver the gas by truck at regular intervals.