Milemax offers performance parts for vehicles, including fuel saver devices that claim to improve gas mileage (claims unverified) and AFM/DFM disablers for GM cars (may impact fuel economy).
Include EcoOBD2, a plug-and-play device that also connects to your car's OBD-II port to optimize fuel consumption, and Fuel Shark, which aims to improve fuel efficiency by stabilizing the vehicle's electrical system.
Customer service helps troubleshoot compatibility questions quickly.
Can make car acceleration feel better for some GM vehicles.
No negative effects reported on basic sedans or trucks by some users.
Price seen as reasonable for experimenting with MPG savings.
App that comes with device doesn’t track MPG reliably.
Indicator light bothers some drivers at night.
Milemax Review
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*Price last updated on Oct 28, 2025. Visit getmilemax.com's pricing page for the latest pricing.
Posted: Jul 12, 2024
Been fixin' cars for 10 years. These things rarely work. Best way to save gas? Regular oil changes, proper tire pressure, and don't be a leadfoot!
Posted: Jul 9, 2024
Love my MileMax! It was super easy to install and it's definitely saving me money on gas. I'm not sure if it's the 35% they say, but I'm getting at least 10% better mileage and that adds up, especially with gas prices being so high. Only downside is the little light on the device can be distracting at night.
Posted: Jul 8, 2024
(Not working) Tried MileMax in my Prius for gas savings. No change! Don't waste money on hybrids. Back to my old ways to save gas.
Posted: Jul 4, 2024
Put MileMax in my minivan a little while back. Hard to say if it helps with gas. Easy to install, but the app seems like a toy. Shows some driving stuff, but gas mileage is a mystery. Might wait and see if it learns how I drive before deciding. Will update if it gets better. Not a magic bullet for gas prices, but not too expensive either.
Posted: Jul 4, 2024
I'm considering buying a MileMax but there are so many mixed reviews online. It's hard to tell what to believe. If anyone has had a positive experience with this product, I'd love to hear from you!
Posted: Jul 3, 2024
I was tempted by the MileMax's claims of huge fuel savings. Before buying, I searched for "MileMax reviews Consumer Reports" but found nothing. That worried me a bit, but the money-back guarantee seemed reassuring. After installing it in my truck, I haven't seen any change in gas mileage. I'm skeptical of the claims now and wondering if I should return it. There seems to be a lack of transparency about how the device actually works.
Posted: Jul 1, 2024
My car isn't anything fancy, but every penny saved on gas helps. Installation was simple, and I haven't noticed any negative effects. As for the claims...well, it's hard to say for sure. Maybe my gas mileage is up a tick, but it could also be due to my recent highway driving. Overall, I'm not blown away, but for the price, it seems like a low-risk experiment.
Posted: Jun 25, 2024
I wouldn't recommend the MileMax for off-road vehicles. I tried it out on my Jeep Wrangler, and it seemed to mess with the engine performance. I noticed a slight decrease in power, especially when climbing hills. Ended up taking it out and sticking to good ol' fashioned driving techniques for better mileage on rough terrain.
Posted: Jun 18, 2024
I put the MileMax in my truck hoping to save some cash on gas. Big mistake. Installation was easy, but after 500 miles, I haven't seen any improvement in mileage. Just a flashing green light and a lighter wallet.
Posted: Jun 12, 2024
I had a question about the AFM/DFM disabler compatibility with my Chevy Tahoe, so I contacted Milemax customer service. They were very responsive and helpful, answering all my questions clearly. I ended up buying the disabler, and the installation process was straightforward. As for the results, it's a bit too early to tell on the gas mileage. But the car definitely feels more responsive on acceleration, which is what I was hoping for. So far, so good, but I'll need more time to see if it impacts fuel efficiency.
Posted: Jun 12, 2024
I wouldn't recommend Milemax to anyone. I bought the fuel saver for my Ford Escape, and it did absolutely nothing. No change in gas mileage, no improvement in performance, just a useless piece of plastic stuck in my OBD-II port. There are probably better ways to save gas, like driving slower or using fuel additives. I'm going to look into those options instead.
