"I've been told by the alignment shop that some sawtoothing is allowed and it will show up more if I increased my city driving. Is this true? "
Keep that alignment guy. Yes this is true. The more city driving the more effect. It has to do with the amount of caster in MBs. Great for handling, a compromise at slow speed. Sort of like a road grader as the wheels are turned the caster causes them to go positive caster on one side and negative on the other.
Bosch Master, ASE Master, L1
33 years MB technician