I bought the FuelSync Fuel Saver for my husband because he’s always griping about gas prices. He said it was “totally worth a try”… a small gadget he could plug in, and maybe reduce our fuel costs. But after weeks of using it, I’m not at all convinced it lives up to the hype.
What Is the FuelSync Fuel Saver?
According to the listing, the FuelSync Fuel Saver is a plug-and-play device that you attach to your vehicle to supposedly increase mileage, reduce emissions, and improve engine efficiency. The marketing promises big fuel savings for minimal effort, pitching it as a simple, high-tech solution to rising fuel costs. 
Why I Bought It for My Husband
He drives a decent amount, errands, work, weekend trips, and fuel costs have been creeping up. Instead of paying for tune-ups or expensive “eco chips,” I thought a cheap gadget like this might offer some real-world savings without any risk. Plus, it sounded easy: plug it in, drive, and save… no big commitment.
Our Experience Using It
Installation & First Drives: We plugged it in, just like the instructions said. Everything looked okay, the device lit up, the car started fine, and there was no immediate error on his dashboard.
Mileage Tracking: My husband kept a close eye on gas consumption for several tanks. But even after running it consistently, he didn’t reliably see any change. Some trips were slightly better, others were worse. Overall, the numbers felt inconclusive.
Mileage “Savings”: The whole point was to reduce fuel usage, but according to his tracking, the gains (if any) were very small. Not the dramatic “30%+) saving you see in some ads. Honestly, any variance could’ve just been normal driving changes, traffic, weight in the car, or driving style.
Vehicle Response: The car didn’t feel any different, no extra pickup, no smoother throttle, no weird beeps or signs of altered performance.
Trust & Doubt: As the weeks passed, both of us started feeling like we bought a gadget more than a real fuel-saver. On researching more, we realized that many experts and reliable sources warn against these devices: motoring journalists have tested similar devices and found just a 0.5% improvement or less. And others say they’re basically gimmicks with no measurable benefit.
Product Claims vs. Reality
- Claim: “Increases mileage significantly.” Reality: Very minimal to no real, consistent improvement.
- Claim: “Reduces emissions/optimizes performance.” Reality: No obvious change in how the car runs.
- Claim: “Easy plug-and-play for all vehicles.” Reality: Easy to plug in, yes, but the benefits are extremely questionable.
- Is It a Scam?
I don’t think it’s a full-blown scam (i.e., you do get a physical device that powers on). I do think it’s highly over-promised, and the real-world benefits, if any, are highly exaggerated: many credible reviews and tests show very little to no measurable fuel savings from similar “fuel saver” devices.
The “save fuel instantly” promise is what got me interested, and that promise wasn’t fulfilled.
How to Use It (If You Still Want to Try)
- Plug it into your vehicle’s OBD (or as instructed).
- Drive as you normally would and track fuel consumption carefully (for at least 4-6 fill-ups).
- Record mileage and fuel used each time to compare “before vs. after.”
- Clean/check the device periodically (if recommended).
Alternatives to Actually Save Fuel
If you really want to cut fuel costs, here are more reliable routes:
- Use eco-driving habits: smoother acceleration, less idling
- Regular maintenance: clean air filters, proper tire pressure, timely oil changes
- Get a fuel-efficient tune-up/chip from a trusted mechanic (not a “miracle box”)
- Consider hybrid or more fuel-efficient vehicle if long-term savings matter
Conclusion — Would I Recommend It?
No, I would not recommend it as a reliable fuel-saving solution. For him and for us, the device didn’t provide consistent savings or performance improvement. If you’re on the fence about spending money on something to save fuel, you’re probably better off focusing on driving better, maintaining the car well, or investing in more proven fuel-efficiency strategies, not another “plug-in miracle box.”
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