FuelMaster™ Fuel-Saver Device
A compact accessory that plugs into your car's 12V socket in seconds. It's designed to help your engine run more efficiently — many drivers tell us they fill up less often, though every vehicle is different and results aren't guaranteed.
- Plugs into any standard 12V socket — no tools, no installation, no mechanic
- Works with gas and diesel cars, trucks, SUVs, and vans (1996 or newer)
- Free tracked shipping from our US warehouse (dispatched in 24–48 hours)
- One-time purchase — no subscription, no recurring charges
11,000+ FuelMaster units shipped to US drivers
Simple to use
1. Plug it in
Insert FuelMaster into your vehicle's 12V accessory socket (the "cigarette lighter" port). The LED confirms it's active.
2. Drive normally
No settings, no app, no maintenance. Just drive the way you always do.
3. Compare your fill-ups
Note your mileage over your next few fill-ups and compare with before. Give it 2–3 tanks for a fair read.
What can you realistically expect?
Honest answer: it depends on your vehicle.
FuelMaster may improve how efficiently your engine uses fuel — many customers tell us they notice the difference within a few tanks. On some vehicles the change is smaller, and on some there may be none. Vehicle age, engine condition, maintenance, and how you drive all play a bigger role than any accessory can.
We can't promise you a specific number, and we won't. What we can promise: try it in your own car, measure your own fill-ups, and if it doesn't earn its place in your 12V socket, send us one email and you get your money back — up to 180 days after delivery.
Product details
- In the boxFuelMaster device + quick-start guide
- PowerStandard 12V accessory socket
- CompatibilityGas & diesel vehicles, model year 1996+
- InstallationNone — plug in and drive
- Vehicle warrantyDoes not modify your vehicle or void warranty
- Returns180-day returns — see policy
Choose your bundle
One-time purchase. No subscriptions, no recurring charges. All prices in USD.
Prefer it faster? You can choose Expedited shipping (+$7.99, 4–6 business days) at checkout, or keep free standard shipping.
3× FuelMaster™
For the whole household
Our 180-day money-back guarantee
Try FuelMaster in your own car for up to 180 days. If you're not satisfied — for any reason — email support@getfuelmaster.com or call (253) 296-2316 and we'll refund your full purchase price. Full details in our Refunds & Returns Policy.
Accessories & add-ons
Optional one-time add-ons for your FuelMaster order. Nothing here is a subscription, and none of these are added unless you choose them.
OptiFuel OBD2 Optimizer
Plugs into your car's OBD2 port to help keep engine settings in their efficient range. $29.99
TPMS Tire-Pressure Sensors (x4)
Solar-powered display + 4 valve-cap sensors. Under-inflated tires waste fuel; this shows all four at a glance. $49.99
3-Socket + 2-USB 12V Splitter
Adds extra 12V and USB ports so FuelMaster and your other devices all run at once. $19.99
Additional FuelMaster™ Device
An extra FuelMaster for a second vehicle, at a reduced add-on price when bought with an order. $19.99
12-Month Extended Replacement Coverage
Free replacement if your device fails from a manufacturing defect within 12 months. Separate from the 180-day refund guarantee. Terms. $4.99
Expedited Shipping
Choose faster 4–6 business-day delivery at checkout instead of free standard shipping. $7.99
Add-ons are optional. Each is selected by you — at checkout or as a one-time offer after purchase — and shown at its price before you confirm. Nothing here is a subscription.
Frequently asked questions
Will it fit my car?
FuelMaster works in any gas or diesel vehicle from model year 1996 onward with a standard 12V accessory socket — cars, trucks, SUVs, and vans.
Will it void my vehicle's warranty?
No. FuelMaster plugs into the accessory socket and does not modify your vehicle in any way. Unplug it and your car is exactly as before.
How fast is shipping?
We dispatch from our US warehouse within 24–48 business hours, with free tracked shipping. Standard delivery is 7–10 business days (Expedited 4–6). See the Shipping Policy.
What results should I expect?
It varies. FuelMaster may improve your mileage — many customers report it does — but results depend on your vehicle's age, condition, and how you drive, and a specific outcome isn't guaranteed. Track your next few tanks and judge from your own numbers.
Is this a subscription?
No. Every bundle is a single one-time payment. You will only ever be charged the amount shown at checkout.
How do I claim the guarantee?
Email support@getfuelmaster.com with your order number any time within 180 days of delivery. Refunds are issued to your original payment method within 5–10 business days.
Individual results vary depending on vehicle age, engine condition, maintenance history, driving style, and driving conditions, and specific fuel-savings outcomes are not guaranteed. FuelMaster™ is an aftermarket accessory and is not affiliated with or endorsed by any vehicle manufacturer.