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If the GRE tunnel is the only traffic going across the MPLS link, something like:
class-map match-any Important
match . . .
policy-map QoS
class Important
bandwidth percent 50
fair-queue !if HQF
policy-map Shape6Mbps
class class-default
shape average 6000000
service-policy QoS
interface tunnel #
service-policy output Shape6Mbps