Mileage checks with GMC

acadia acadia limited b7t042 c4 c4c042 c4e042 c4v042 c5c042 c5e042 c5v042 c6c042 c6h042 c7c042 c7h042 c7h064 c8c042 c8c064 canyon envoy f6b042 f7b042 f7b064 jimmy safari savana sierra sierra 1500 sierra 2500 sierra 2500hd sierra 3500 sierra 3500hd sierra classic 1500 sierra classic 2500 sierra classic 2500hd sierra classic 3500 sierra hybrid sonoma terrain w35042 w45042 w55042 yukon yukon denali yukon hybrid yukon xl