From Lancaster to Mammoth there is ESTA(?) Eastern Sierra Transit Authority which stops anywhere you want them to. What My wife and I did in 2009, we left our car in Lone Pine with friends, took the ESTA bus to Mammoth, stayed overnight at a Campground across from McDonald's and early next morning took the YART bus to Yosemite. Hiked the JMT from Yosemite to Lone Pine and our car. Worked just fine. Make bus and other arrangements well before your trip.
Last edited by asmrz
on Fri Mar 09, 2012 5:05 pm, edited 1 time in total.