We use to use Fuelman Gas cards. Recently switched to WEX. Each tech gets a pin they have to input into the pump each time it’s used. You can set spending limits per 24 hours as well as say how many times they can gasup in a 24 houf period.you can also limit what each card can be used for (ie unleaded gas only, diesel only, or both, oil, wipers, drinks, etc...) there’s a ton of flexibility to fit your needs. We save .10 per gallon. Our techs gas up st the completion of their route EVERYDAY regardless of how much they used. At the pump, the driver has to input truck mileage (after his pin) before pumping, that way you can run reports per truck to see how much fuel was used and how many miles were driven and compare MPG. Hope this helps