Fuel Tracking on Site: Stop Burning Money

The Black Hole in Your Budget

On a decent-sized civils job, you might be burning through £3,000–£8,000 a week in diesel. Excavators, dumpers, telehandlers, generators, welfare units, pumps — they all drink the stuff. And on most sites I've worked on, the fuel bowser sits in a compound with a handwritten log book that's either missing, soaking wet, or has entries like "dumper — some fuel — Dave." That's not tracking. That's guessing.

The frustrating thing is that fuel waste is almost entirely preventable. Machines left idling overnight, generators running at weekends when nobody's on site, bowser deliveries that don't match the site consumption — these are all things you can see and fix, but only if you're recording the data in a way that lets you spot the patterns.

What Good Fuel Tracking Looks Like

At a minimum, you need to record every fuel transaction: date, time, machine or equipment ID, litres dispensed, operator name, and hours or miles on the machine. That last one is important — if you know the litres and the hours, you can calculate litres per hour for each machine. Compare that against the manufacturer's spec and you'll quickly spot which machines are running inefficiently. A 20-tonne excavator should be burning roughly 12–18 litres per hour depending on the work. If yours is doing 25, something's wrong — either the operator's technique, the machine's condition, or both.

Ebrora's Fuel Usage Calculator does this maths for you. Plug in the machine type, hours worked, and fuel consumed, and it gives you a litres-per-hour figure benchmarked against typical rates. It flags anything that looks abnormal so you can investigate before the cost blows out.

Tackling the Common Leaks

Idling. A 20-tonne excavator idles at roughly 4–5 litres per hour. If it sits running for an hour at lunch, that's £5 of diesel going nowhere. Multiply that across ten machines and five days a week and you're looking at over £1,000 a month in idle fuel. Some newer machines have auto-idle or auto-shutdown features — make sure they're turned on.

Generators running out of hours. Walk past your compound at 7pm on a Friday. Can you hear a generator? If yes, why? Welfare units with electric heaters and a timer-controlled generator shouldn't need to run 24/7. Set timers, use thermostatic controls, and check at the end of every shift that non-essential power is off.

Delivery discrepancies. When the bowser gets refilled, check the delivery docket against the tank gauge. If the bowser holds 2,500 litres, it was showing 400 before the delivery, and the docket says 2,000 litres delivered, the gauge should read 2,400. If it doesn't, either the delivery was short or you've got a leak. Check every time.

Linking Fuel to Programme

The really useful thing about proper fuel tracking is linking consumption to activities. If you know that Phase 2 bulk excavation burns 3,500 litres a week across three machines, you can forecast fuel costs for Phase 3 accurately. That feeds into your CVR, your cash flow, and your monthly application. It also lets you spot when productivity drops — if the fuel goes up but the quantities don't, either the ground conditions have changed or something's going wrong with the operation.

This is where fuel tracking stops being a cost control exercise and becomes a programme management tool. The site manager who knows their fuel numbers knows their programme better than the one who doesn't. It's one of those leading indicators that tells you something before the earned value report does.

Environmental Reporting

If you're working under an environmental management plan — and on any AMP water industry contract you will be — fuel consumption feeds directly into your carbon reporting. Every litre of diesel produces roughly 2.68 kg of CO2. Your client will want that number quarterly, and if you've been tracking properly it's a five-minute spreadsheet exercise. If you haven't, it's a week of guesswork. Our Carbon Calculator ties fuel data directly to CO2 output.

Start tracking today. Even a simple spreadsheet with date, machine, litres, and hours will transform your visibility within a week. You'll find the waste, and more importantly, you'll be able to prove you found it — which is exactly what the QS, the PM, and the client want to see.