Testimonials:
our customers’ numbers speak for themselves
Measured results,
not promises
More than 100,000 trucks tuned since 1987, that adds up to a lot of satisfied customers. And the most convincing part is their numbers: miles per gallon gained, measured power, savings seen at the pump.
The testimonials below come from real Diesel Spec customers: owner-operators, fleet managers and competitors, on Cummins, Caterpillar and Detroit Diesel engines.
Fuel economy
the gains at the pump
“I was running at 5.7 mpg with my 2009 Cummins ISX, and now I’m getting 7.5 mpg! I should have had my tuning done way sooner. Thanks to the whole Diesel Spec team!”, owner-operator, 2009 Cummins ISX. A gain of more than 30% on fuel consumption.
“Not only is my truck nicer to drive since you made it more powerful, but I’m also saving 1 mile per gallon on fuel. I recommend every truck owner pay a visit to Diesel Spec.”, owner-operator, Quebec.
“Thanks for bringing my engine back to life! 100 more horsepower and 10% savings. Good investment.”, trucking company, Quebec.
“You worked miracles with these trucks, including mine. After the tune, I gained a lot more hp and an extra 1.3 miles per gallon. The diesel savings were surprising.”, fleet manager.
Performance
power that delivers
“Thanks to the Diesel Spec team for making my Detroit Diesel engine the strongest working truck on the road in Canada, with more than 2,500 horsepower! They also did my whole fleet of Cummins engines with incredible fuel economy results.”, fleet owner (Detroit Diesel and Cummins).
“Thanks to Diesel Spec for giving my Detroit DD15s the power I needed while saving on fuel! Thanks also for the ECM on my racing Series 60 that turns at more than 4,000 RPM.”, owner-operator, Detroit DD15 and racing Series 60.
“Diesel Spec transformed my twin turbo Caterpillar: major savings every year and no more problems. What more could I ask for?”, owner-operator, twin turbo Caterpillar.
“I had my ECM tuned for my C15 and my fuel economy improved. Thanks also for the racing ECM: we finished 2nd at Baie-du-Febvre and 1st at Saint-Joseph-de-Beauce in Class C this year.”, truck pull competitor, Caterpillar C15.
30-day money-back guarantee: results, or your money back.
Reliability and trust
for the long haul
These testimonials cover our three service families: Fuel Economy, Performance and competition setups.
What customers mention most often
- “Thanks for saving me serious money on fuel and making my engine much more reliable over the past 2 years.”, owner-operator
- Measurable gains within the first weeks, that last over time
- Professional service, from diagnosis to final tuning
- Peace of mind: 30-day money-back guarantee
Frequently asked questions
Are the gains in these testimonials typical?
How can I find out what my truck could gain?
Is there a warranty on Diesel Spec tuning?
Where can you get your truck tuned?
Talk to a Diesel Spec expert
Personalized estimate for your truck or your fleet, with an answer within 24 hours. 30-day money-back guarantee.
Talk to a DSI expert
Documentation, a call back from an advisor, an estimate for your truck or your fleet. An expert will contact you within 24 hours.