At an exit with supplementary diesel fuel service, what fuel type is primarily mentioned?

The primary fuel type mentioned at an exit with supplementary diesel fuel service is diesel. This indicates that the location is equipped specifically to cater to vehicles that run on diesel fuel, which is commonly used by larger vehicles such as trucks and some cars. Diesel fuel is a distinct type of fuel that has different properties and performance characteristics compared to gasoline.

Locations with supplementary diesel fuel service are often designed to meet the needs of commercial vehicles, and providing diesel at these exits helps ensure that drivers of such vehicles can refuel conveniently while traveling. This is particularly important for long-haul truck drivers who need to maintain their schedules and have access to the right type of fuel on their routes.

In contrast, options like premium gasoline, regular gasoline, and electric charging refer to different types of fuel or energy sources that do not apply specifically to the context of supplementary diesel fuel service, which focuses entirely on diesel compatibility.