Most small dealers run a mix: a base of automatic-delivery customers you keep full using degree days, plus a stream of will-call customers who phone in when the gauge gets low. The trouble is that will-call and keep-full pull in different directions — one is reactive, one is predictive — and a lot of software handles one well and the other badly. FillDesk Pro treats them as one operation.
Will-call that does not fall through the cracks
When a will-call customer phones in, they land on the same daily fill report as your automatic customers, so a dispatcher builds one route that covers both the tanks the forecast flagged and the customers who called. Nothing gets scheduled twice and nothing gets forgotten between the message pad and the truck.
Forecasting that shrinks the will-call pile
The more accurately you forecast your automatic customers, the fewer emergency will-call runs you make. FillDesk Pro tracks a per-customer K-factor — gallons per degree day — that recalibrates after every delivery, and pulls daily temperatures from the US National Weather Service. The daily fill report ranks tanks by projected level, so you catch the customer who is about to run out before they have to call, and you fill a full truck on a tight route instead of chasing one-off runs.
The driver app keeps the loop closed
On the truck, the driver runs the offline web app — meter readings, gallons (temperature-corrected to 60°F when you bill net), photos, and signature — all captured even with no signal and synced when service returns. The moment a delivery posts, that customer's K-factor updates and their next projected fill date moves, so tomorrow's will-call pile is smaller than today's.
Tank monitors for the ones that matter
For high-value or hard-to-predict customers, attach a tank monitor. FillDesk Pro ingests telemetry from Otodata, Smart Oil Gauge, and Tank Utility and flags divergence between the live reading and the forecast — so a customer who suddenly starts burning faster shows up as an alert, not as a 6 a.m. will-call.
Billing keeps up with the mix
Because will-call and automatic deliveries flow through the same tickets, they flow through the same billing. A day of deliveries — however they were triggered — becomes invoices in a couple of clicks, with receivables aging so you can see who is behind at a glance. Delivered gallons carry the temperature correction when you bill net, so the figure on the invoice is the figure your tax and margin math actually depend on. There is no separate will-call ledger to keep in step with the automatic side; it is one operation, one set of books, and one export whenever you want your data.
See it on your routes
The best way to judge a will-call workflow is to run a real week of it. Start a free pilot, or read about tank-monitor integration, degree-day forecasting, and pricing.