Where near Escondido are there gravel roads or trails for gravel bike riding?

Dixon Lake, Elfin Forest/Oliveheim Reserve, Lake Hodges, Cielo Trails, Stanley Peak, Rancho Bernardo trails.

Del Dios County Preserve to and around Elfin Forest. Also could extend along San Dieguito River Park, but that's mostly calm (no gravel or rocks) dirt trails.

Black mountain open space has the best gravel bike routes. The loop has a great trail that is moderate with a lot of gravel.