In fact, GM has been doing the opposite. GM has been reducing fleet sales and reducing fleet sales to rental car companies the fastest. Rental Car sales usually have less than 1% profit.
GM makes over 70% of its profits on full size pickup trucks and full size pickup truck based SUVs.
Tesla is putting a hurt on Germany's Big Three first.
Once Tesla has their full sized pickup,and my guess a Suburban/Escalade killer too, then Tesla will put a big hurt on the Detroit Big Three.
Did GM Maintain the Right Balance between Retail and Fleet Sales in August? - Market Realist
"But notably, earlier this year, GM guided that it would maintain its fleet sales below 20% of its total vehicle sales. In August, its fleet sales were just 17% of its total vehicle sales, and the company reported a YoY (year-over-year) decline of 34% in its rental car sales.
Unlike Ford (F), GM has been cutting its fleet sales to rental car companies for the last several quarters in order to protect its margins and to utilize plant capacity to manufacture more profitable vehicles for retail customers."