GM cites production line efficiency increases accomplished by the team at the Flint Assembly plant in Michigan. GM has also promised increased shipments of the Chevrolet Colorado and GMC Canyon mid-size trucks by about 30,000 total units between mid-May and the week of July 5. The automaker says that its team is completing dynamic vehicle testing on units held at the plant due to semiconductor supply shortages. Some smaller volumes of vehicles held at other plants will also complete their dynamic vehicle testing and ship to dealers during June and July. General Motors also says that assembly plants that build its most capacity-constrained products won't be taking dedicated vacation downtime this summer. Another interesting tidbit has surfaced with General Motors confirming that it's removing auto start-stop technology from some of its trucks. The auto start-stop technology is a feature that annoys many owners and won't be missed.