Fuel is the largest line on most fleet P&Ls — and almost all of the waste is invisible until you measure it. iMatrix reads burn rate, idle, and tank level over CAN with FC-501; correlates with NEO-1 ambient temperature; and detects fuel-cap tampering with Sentry-1.
FC-501 reads engine RPM, vehicle speed, and PTO state. Stationary RPM > 0 for > threshold = idle alert. PTO-justified idle excluded automatically.
Per-driver MPG, per-route MPG, per-load-weight MPG. Find the 10% of drivers and 5% of routes responsible for 30% of overspend.
Sentry-1 on the fuel cap or saddle-tank cabinet. Off-shift opens fire as a tamper alert — before the fuel disappears.
Fuel data lives in three places: the engine ECU, the tank itself, and the cap on top of it. iMatrix reads each one with the right device — and joins them in one analytic view.
Reads SPN 183 (fuel rate), SPN 96 (fuel level), SPN 190 (engine RPM), and idle state from J1939. PTO state captured to exclude legitimate idle. Idle thresholds configurable per vehicle class.
Diesel volume swings ~0.07% per °C. NEO-1 inside the tank cabinet (or on the tank wall) gives you the temperature to normalize fuel-level readings — separating physics from theft.
Magnetic sensor on the fuel cap door, saddle tank, or yard fuel-pump cabinet. Open events outside dispatch hours fire instantly. Cuts the most common form of fleet fuel theft to a near-zero risk.
FC-501's J1939 decoder pulls fuel-rate and fuel-level SPNs continuously. Idle classification runs on-device — only the rolled-up event hits the cellular link.
NEO-1 ambient temperature feeds into the volume calculation. Reported levels are corrected to 60 °F so day-to-day swings don't look like loss.
Per-driver dashboards: idle minutes, harsh-accel events, MPG vs. peer median. Drivers see their own scorecard; managers see the rollup. Insurance discounts often follow.
Sentry-1 tamper + tank-level drop + GPS = automatic incident report with location and time. Recovery rate climbs because evidence is on the timeline already.
Idle reduction is the single largest fuel saving. Catching 30 minutes/day across 100 trucks pays the iMatrix bill on its own.
Yellow iron sits idling at job sites for hours. PTO-aware idle classification distinguishes legitimate auxiliary load from waste.
Sentry-1 on shop fuel-island cabinets. Off-hours open events catch the most expensive theft of all — bulk fuel disappearing from the yard.