"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.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician