The Chevy Colorado's drop in sales from May (8,881) to June (6,558) was significant. The GMC Canyon was also down about 20% in June (compared to May). Toyota's mid-size pickup truck market share grew in June with the Tacoma selling at 15,959. With both companies now building trucks on three shifts, we can see how the market will end up stabilizing. Toyota will retain a 2 to 1 or greater sales advantage unless something changes. In just a month or two the newly designed and much improved 2016 Toyota Tacoma will go on sale making things a bit more difficult for Chevy's Colorado. However, the Colorado is bringing a new diesel engine to the game, so that should offer Chevy at least a few months of strong sales. Toyota does not plan to offer a diesel.