Knowledge Hub

Fleet Fuel Efficiency & Diesel Tips — FuelMarble Blog

Written by fleet industry specialists and diesel engineers, the FuelMarble blog covers practical fuel cost reduction for UK and US fleet operators — from DPF maintenance and HGV fuel efficiency to independent technology comparisons and real-world trial data. All performance claims are sourced from documented trials; all cost figures use current fuel prices.

Topic Hubs

Technology

What Is FuelMarble?

Complete guide to the technology, mechanism, and science

Comparison

UK Fuel Saver Products 2026

The definitive comparison of every fuel saving device on the UK market

Fleet

Fleet Fuel Efficiency Guide

How UK fleet managers actually cut diesel costs — the complete guide

HGV

HGV Emission Systems

Heavy-duty truck maintenance, DPF, SCR, and Euro VI aftertreatment

Showing 1–20 of 58 articles · page 1 of 3

Fleet

UK Diesel Prices Surged 54.5% in Early 2026 — Here's What It Actually Cost a 10-Truck Fleet

Wholesale diesel rose 54.5% between January and late March 2026 (Logistics UK). We calculate the exact +£368,230 hit to a 10-truck HGV fleet — and the one cost lever operators control.

Avery4 Jun 2026

A 12,000-tonne Japanese car ferry crossing coastal waters at dawn, representing the Miyazaki Express route from Osaka to Miyazaki

Case Study

Does a 5.9% Fuel Reduction on a 12,000-Tonne Car Ferry Hold Up Under Government Scrutiny?

Japan MLIT verified 5.9% fuel reduction on the 12,000-tonne Miyazaki Express car ferry — ¥52,776,977 in documented annual savings. Mechanism, IMO CII impact, and installation data from the official government report.

Avery1 Jun 2026

Kenworth T680 semi-truck parked at a dark Texas truck stop with a diagnostic cable visible from the OBD port, illustrating professional truck fuel saving device testing 2026

US Fleet

Do Fuel Saving Devices for Trucks Work? Engineering Verdict 2026

Most fuel saving devices for trucks fail the engineering test. ECO OBD2, HHO kits, and magnetic ionisers have no credible mechanism. One category does — here's the data.

Elias Thorne26 Apr 2026

A Kenworth T680 Class 8 semi truck on an empty interstate highway at dusk, low-angle front-quarter view showing trailer side skirts and dashboard glow, representing diesel fleet MPG optimisation.

US Fleet

How to Improve Diesel Truck MPG: 6-Step Framework (2026)

Class 8 diesel truck MPG improvement framework for US fleet operators. Geotab 1.6M-truck benchmarks, driver behaviour, DPF health, idle reduction, aerodynamics, and combustion thermal hardware with an interactive fleet savings calculator.

Elias Thorne26 Apr 2026

Fleet

Fuel Card Comparison UK HGV 2026: Keyfuels, Allstar & BP Bunker

Diesel hit 191p per litre in April 2026. For a 20-vehicle HGV fleet, choosing the wrong fuel card costs tens of thousands per year. Full comparison of Keyfuels, UK Fuels, BP Plus Bunker, and Allstar — plus how to stack card savings with telematics and efficiency technology.

Avery10 Apr 2026

Volvo FM HGV on UK motorway, close-up of emissions system components, dark desaturated treatment

Fleet

EGR Valve Cleaning Cost for HGV Fleets: UK 2026 Guide

EGR valve cleaning for a heavy goods vehicle in the UK costs £250–£600. Fleet operators who clean reactively face 2–4× the cost of proactive operators. Full decision framework: when to clean, when to replace, and how to reduce buildup.

Avery9 Apr 2026

Euro VI HGV truck parked at a UK logistics depot, undercarriage showing exhaust aftertreatment system, dark industrial atmosphere

Fleet

HGV DPF Cleaning Intervals: The Definitive Fleet Guide

Most HGV fleet managers know they need to clean their diesel particulate filters. Very few know when — and the wrong interval costs thousands. Here are the exact intervals by duty cycle, the warning signs, and a scheduling framework for your fleet.

Avery8 Apr 2026

Volvo FM HGV on a UK motorway on a dark winter morning, headlights on, wet tarmac reflecting orange gantry lights

Fleet

Cold Weather HGV Fuel Consumption: The Cost UK Fleets Are Missing

Cold weather increases HGV fuel consumption by 10–20%. At 188.8p/litre that is £3,000–£5,664 per vehicle per winter — a cost that never appears on a standard fuel report. Here is how it compounds, and how to recover it.

Avery7 Apr 2026

Row of HGV lorries queuing at a UK motorway diesel forecourt at dusk with fuel price board visible

Fleet

UK Diesel Hits 176p — 30-Day Fleet Action Plan

UK diesel at 176.5p/litre adds £79,500 of unplanned cost to a 20-vehicle HGV fleet vs the 150p budget baseline. Here is the 4-action response — benchmark, DPF, fuel card, combustion.

Avery7 Apr 2026

A heavy goods vehicle at a UK motorway service station forecourt at night — representing the confirmed fuel duty increases arriving September 2026

Fleet

What Do the Confirmed UK Fuel Duty Increases Mean for Your Fleet Budget Between September 2026 and March 2027?

The confirmed duty schedule adds 5p/litre to every litre your fleet burns by March 2027 — in three staged increases already locked into Treasury policy. Here is the per-fleet-size impact, the confirmed rates, and the offset window before September 1.

Avery7 Apr 2026

White Transit vans parked at a commercial depot yard at dusk with one bonnet raised under a sodium lamp

Fleet

Why Can't Small Fleet Operators Buy the Fuel Efficiency Technology That Actually Works?

57% of UK fleet operators run fewer than 50 vehicles — and every enterprise fuel catalyst requires minimum volumes they cannot meet. Here is what actually works.

Avery7 Apr 2026

Fleet

Tyre Pressure Costs UK HGV Fleets £35,000+ a Year — Here's the Fix

Underinflated tyres drain £718 per vehicle per year at current diesel prices. Here are the numbers, compliance requirements, and the zero-cost fix for UK HGV fleets.

Avery6 Apr 2026

Fuel Ox combustion catalyst additive bottle versus FuelMarble coolant-circuit device — side-by-side comparison

Fuel Saver

Fuel Ox vs FuelMarble: Why One Combustion Catalyst Gives You a Range of Results and the Other Gives You a Consistent Number

Fuel Ox vs FuelMarble: direct comparison of mechanism, verified data, DPF claims, and 3-year cost — so truck and fleet operators can make the right call.

Elias Thorne5 Apr 2026

Fleet

Fleet Telematics Fuel Savings: Real Numbers for UK HGV Operators

UK HGV fleets using telematics achieve 10–15% fuel savings. Here are the verified numbers on driver behaviour, idle time, and route optimisation — and what happens when telematics hits its ceiling.

Avery3 Apr 2026

fuel economy

Why Is My Car Using More Fuel Than Usual? 7 Causes and How to Fix Them

Sudden mpg drop? 7 causes account for most unexplained fuel consumption increases in UK petrol and diesel cars — with costs, fixes, and real-world examples.

Elias Thorne2 Apr 2026

DPF cleaning cost UK 2026 — workshop price comparison guide for van and fleet operators

DPF

DPF Cleaning Cost UK 2026 — What Workshops Won't Tell You

DPF cleaning UK 2026: £80 forced regen to £5,000+ HGV replacement. What each method costs, what works, and what workshops don't tell you.

Elias Thorne29 Mar 2026

tyre pressure

Does Tyre Pressure Affect Fuel Economy? UK Drivers Guide

Yes — low tyre pressure costs UK drivers up to £90 a year in wasted fuel. Learn how much, why it happens, and what tyre pressure alone cannot fix.

Avery27 Mar 2026

Commercial DPF cleaning cost UK 2026 — fleet guide to HGV DPF clean prices, forced regen, and replacement costs

DPF

How Much Does a Commercial DPF Clean Cost in the UK? (2026 Fleet Guide)

Commercial DPF cleaning costs £300–£800 in the UK. Compare forced regen, chemical flush, and ultrasonic methods. 2026 fleet guide to costs and prevention.

Elias Thorne26 Mar 2026

Fleet

Does Switching From a Diesel Fuel Additive Programme to Hardware Actually Save UK Fleet Money — or Is That Just a Sales Argument?

A 30-vehicle fleet running a diesel additive programme costs £26,400 in year one once DPF failure liability is included. Hardware costs £15,570 once. The full TCO comparison for UK fleet managers.

Avery24 Mar 2026

Fleet

A 30-Vehicle Diesel Fleet Spent £26,400 Last Year on a Fuel Additive Programme. Here Is the 3-Year Spreadsheet That Ended It.

A 30-vehicle diesel fleet's additive programme cost £26,400/year once DPF liability was included. See the full 3-year TCO comparison table across 5 fleet sizes — and the hardware payback in weeks.

Avery23 Mar 2026