Sorry, it can get confusing since the level of redactions normally goes up over time. I got my version pretty early after this document was related (by KSAT, I think). If you want to check my calculations or do your own calculations in a similar way, you merely need the exact Valero address and time (11:15 am on 10/7) and the exact vehicle license plate reader address (harder to get, but it can be interpreted based on that affidavit) and time (1:41 pm on 10/7). Then, don't forget to consider that Brad's truck was seen in the Medina area for 13 minutes between these two other sightings.
Obviously, the times are not reported to more than the minute (so there is limited temporal resolution, and a small error associated with that), and, of course, one needs to make a few basic assumptions, which will also likely introduce errors. To me, this method looks very interesting, especially considering that police never shared where Brad's black truck stopped between these two locations for an extended period of time (although it seems authorities must know more about this time period than provided in the affidavit).