Published evidence behind the methods
The 20 Percent Fuel framework also aligns with published fleet case studies from around the world.
These examples show that structured eco‑driving programs, when combined with manager follow‑up,
consistently produce measurable fuel savings.
Public Service Company of New Mexico (US)
The U.S. Department of Energy’s Alternative Fuels Data Center says PNM’s system, used to monitor fleet performance,
track driver behaviour, and inform driver training, improved the fleet’s average fuel economy by 15%.
The same case study says PNM had about 700 vehicles traveling 5 million miles annually.
US DOT / FMCSA heavy‑truck evidence
A U.S. Federal Motor Carrier Safety Administration brief says driver behaviour is the largest single contributor to fuel
efficiency, and that there can be as much as a 35% difference in fuel consumption between a good driver and a poor driver.
The study involved a 10‑month field evaluation in 46 Class 8 trucks, combined with staged driver interventions
like feedback, coaching, and rewards.
Seattle government fleet (US)
A government‑fleet report highlighted by NREL points to the City of Seattle case,
where Philip Saunders said telematics integration helped save $2 million in fuel.
U.S. Department of Energy
The U.S. Department of Energy says driver incentives and training, combined with broader fuel‑management strategies,
can reduce fleet fuel spending. Separately, a U.S. DOT research summary
on eco‑driving says evidence from Europe, Asia, and North America suggests truck
eco‑driving programs can save fuel in the 5% to 15% range.
International cases
This approach has also delivered results outside the U.S. In Ireland, a government‑backed fleet pilot covering 12 companies,
326 vehicles, and 371 drivers reported an 11% reduction in energy consumption after combining telematics
with eco‑driving training and ongoing measurement.
Tesco.com fleet (UK)
A UK government evidence review reported that Tesco.com achieved about
12% fuel savings after introducing telematics with eco‑driving training across a fleet
of around 2,200 vans covering roughly
60 million miles per year.
FORS Gold case studies — UK fleets
A FORS document reviewing 138 Gold case studies reported an
average 14% improvement in mpg among fleets that submitted
fuel‑use results.
How this supports 20 Percent Fuel
These published fleet results are not claims about the 20 Percent Fuel product itself.
They are evidence that the core methods behind the framework work in real commercial fleets.
20 Percent Fuel was designed to turn those proven principles into a simpler, manager‑friendly implementation system
for fleets that want to pursue fuel savings in the 10–20% range without building the process from scratch.
Results vary by fleet size, vehicle type, routes, traffic conditions, driver habits, and implementation quality.