Hah, yeah, I haven't done an extremely large amount of spraying on row crop stuff but what you're saying would work well with your spray rig being twice the size of your planter. We plant 16 30" rows and our sprayer is 76' 8". When we got it, it was 75' set up with 20" spacing. We wanted less nozzles to deal with and we wanted to be able to use drop nozzles on row crops so we switched it to 30" spacing. The rest of the story is a mess to explain but in the process it turned into an almost 77' sprayer. Anyways, suffice it to say, we wouldn't consistently be anywhere and would be trying to find foam that had dropped between rows or we would be very slowly counting 30 and 2/3 of a row at each end all day.

Your point on not having enough information in the original post is well taken. I would venture to say that it's likely he was overlapping more before auto-steer because he said he agrees that with auto-steer you use less water. I would also tend to lean towards believing that if 90 to 95% of the targeted rate is acceptable, then it would be possible to minimize overlap and put that rate on a larger percentage of the entire field and still save a significant amount of money.