IF I was driving an expensive company car with the graphics "Very Important Bankers" on the side, carrying two people from another company that were also going about their business, and I had to return the vehicle with a minimum level of fuel to do 75 miles, I'd have to decide whether I wanted an ear-roasting for returning with below minimum required fuel level or an ear-roasting for parking up in a hostile environment with consequent risk to the vehicle, inconvenience to the people I was carrying and having to wait a considerable time for the RAC to tip up and refuel me. I think I'd press on.
With no minimum fuel requirement I'd definitely press on. With a faulty gauge that told me I'd both get there and be above the minimum there is no question.