The table that covers allowable span for lumber is Table 2 on page 2 of the Guide. If you are using southern pine, which is typically the case for PT lumber, you look on the first line of the table, which is for 2x8 lumber. You will see that the figure for joist spacing 12 inches used to be 13'8", which is now crossed out (2013 revision), and has been reduced to 13'1". If there is an overhang, you move to the right and you will see figures for an overhang not to exceed Lj/4, where Lj is the maximum joist span. That figure is 10'1" for joists spaced 12 inches OC.
If you read the footnotes, you will see that the tables are derived based on 40 psf live load and 10 psf dead load, plus additional deflection assumptions and service characteristics of the lumber. So there is adequate information to state that IF the OPS is allowed to use the Prescriptive Residential Wood Deck Construction Guide, then based on the OPS description of the deck as using 2x8 PT lumber (assumed to be southern pine), and with an overhang, the maximum allowable span of a joist is 10'1".
If the OPS is required to use a different code, then then results may be different.