To Eagle Pass Texas
Cross border. Mex 57 and 57-D is an inexpensive, safe 4 lane route.
Decision time approaching Mexico City
I still prefer at San Juan del Rio to head east to Pachuca, then south toward Tlaxcala. Toll road free. Fairly rapid. Then a short zig to the left at Puebla lines you up with the toll highway to Oaxaca.
I still do not trust the myriad of laws and regulations in the state of Mexico. I'd much rather save toll money and potential cop hassles and take my old route above. Every time I hear about the bypass around Mexico City by toll road I hear of three new cops hassles.
Take it easy on the Puebla Oaxaca 2-lane toll road. No matter how fast or slow I drive, there are cars trucks and buses driving faster or slower.
I find driving in downtown Oaxaca to be a bummer. Absolutely no parking spaces within thousands of yards. Taxis are not cheap but buses are. Line your bus route up with a fellow RV'er.