Earlier quoted context omitted.
Not necessarily if you count capital costs vs operating costs/margins. Replacing cars every 3 years vs a couple % in efficiency is not an obvious trade off. Especially if you can do it in 5 years instead of 3.
You highlight the exact dilemma. Company A has taxis that are 5 percent less efficient and for the reasons you stated doesn't want to upgrade. Company B just bought new taxis, and they are undercutting company A by 5 percent while paying their drivers the same. Company A is no longer competitive.
The scenario doesn't add up.