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Cost Control

Idling (Engine Running While Parked) Wastes The Most Money In Any Fleet. Here Is How To Stop It.

An engine running while the vehicle stands still is the clearest waste in any operation, and it is the one cost every fleet can cut within a month.

1 September 2026 · 6 min read

Fleet operations in Caribbean

~0.6 gal

fuel burned per idle hour by a light commercial engine

US Dept of Energy

60-120 min

typical unmanaged idle time per vehicle per day

MGFleet baseline studies

4 weeks

to a clear starting point before you change anything

MGFleet method

Why Idling Is The Best Place To Start

Every other saving needs you to change how the fleet works: routes, staff, schedules. Cutting idling just needs someone to notice it happening. That is why it pays off first.

A light commercial engine burns roughly half to three quarters of a gallon of fuel an hour just standing still with the engine on. Ninety minutes a day, five days a week, across fifteen vehicles, and you are paying to fuel a vehicle that never even leaves the yard.

Where a typical unmanaged day goes
Productive driving52%
Idling19%
Stopped, engine off24%
Unbooked movement5%

Measure First, Talk Second

The instinct is to send a memo telling everyone to stop idling. Don't. Run the tracking devices quietly for four weeks first, without telling anyone to change anything, so you get an honest starting point for each vehicle and driver. Then, when you tell a driver his idle time is forty minutes above the team average, it is a fact, not an accusation.

Fleets that share idle numbers every week usually cut them in half within two months. Fleets that just send an email about it do not.

Then Check The Fuel Card

The second-fastest saving is checking the fuel card records. Match every fuel purchase to where the vehicle actually was at that time. You are looking for three warning signs: a fill-up where the vehicle was not, a fill-up bigger than the tank, and two fill-ups close together.

A four-week programme

Week 1-4 measure quietly. Week 5 share each vehicle's idle numbers. Week 6 set a fleet-wide target and a target per driver. Week 7 start checking fuel card purchases against vehicle location. Week 8 review results with the team and reward the top three.

What Good Looks Like

  • Idling under ten percent of total engine-on time for most road fleets.
  • Every fuel purchase matched to a vehicle within a hundred metres and ten minutes.
  • After-hours movement flagged within minutes, not discovered the next morning.
  • A short weekly summary shared with the team, not just kept in the office.

None of this is complicated. It is simply the difference between a fuel bill you just receive and a fuel bill you can actually explain.

One last thought

What would this look like on your own vehicles?

Everything above is easier to judge with your own numbers in front of you. Tell us how many vehicles you run in the islands and what is costing you most right now, and we will put real figures next to it — fuel, hours, wear, the lot — so you can see whether it is worth doing at all.

It takes about five minutes, it costs nothing, and if the numbers do not stack up we will tell you so.

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