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A Toyota Highlander owner says, “My gas mileage is terrible, but I’m not changing my gasoline octane opinion.”
So, what should this Highlander owner do to improve his fuel mileage? Before I discuss the solutions, here is what Malachi Parker on the Toyota Highlander Owners Club Facebook page says,
“So, I have a 2016 Toyota Highlander XLE V6 FWD. My gas mileage is terrible (I need to refuel every 2 days). I use 89 or 91 octane (I use what I want; I don’t need anyone telling me what octane to use). I normally use SHEETZ or WAWA, but what do other owners prefer? I live in NC, and the gas prices aren’t an issue with me.”
“What do y’all recommend I do to increase gas mileage? (I only use Sheetz because my household has a business card.) I love Wawa (also I get 22-28 mpg), city and highway driving all day, every day.. I drive a lot. My Highlander doesn’t get a break unless it’s time to go to bed.”
How Can Highlander Owners Maximize the Toyota Highlander’s Fuel Economy?
Malachi has a common problem: His 2016 Toyota Highlander V6 FWD is drinking gas faster than he’d like. Malachi is on the road “all day every day,” driving his Highlander so much it “doesn’t get a break unless it’s time to go to bed.” This kind of heavy, real-world driving puts any vehicle’s fuel economy to the ultimate test.
First, let’s address the baseline.
The EPA-estimated fuel economy for a 2016 Highlander V6 FWD is 19 MPG city and 25 MPG highway. Malachi reports getting between 22 and 28 MPG, a range that actually meets and often exceeds the official ratings.
When a vehicle is driven constantly—meaning the engine is always running, whether for city stop-and-go or sustained highway cruising—he’s doing a lot better than he thinks. However, having to fill up every two days is certainly a logistical headache, so let’s dig into solutions for this 2016 Toyota Highlander V6 FWD owner’s gas mileage challenge.
The Octane and Gas Station Myth: Don’t Waste Your Money
Malachi mentioned using 89 or 91 octane, which is the first and easiest way to save money and slightly improve efficiency. For the 3.5-liter V6, Toyota explicitly recommends 87 octane fuel. The engine’s computer (ECU) is tuned for this specific rating. Higher octane gas is only necessary for high-compression or turbocharged engines to prevent pre-ignition (knock). His naturally aspirated V6 does not need it.
Using 89 or 91 in an engine designed for 87 is like paying for a premium coffee that tastes the same as the regular blend—you’re getting no benefit, just spending more. Stick to 87 octane gasoline for the most efficient and cost-effective performance.
As for the brand of gas—Sheetz versus Wawa—both are generally reliable retailers. The most important factor in this debate is choosing a TOP TIER Detergent Gasoline retailer, which both Sheetz and Wawa qualify. Top Tier gas has a higher concentration of engine-cleaning additives than the minimum required by the EPA, which helps keep your fuel injectors and valves clean, thereby maintaining optimal long-term fuel economy.
Since he has a business card for Sheetz, sticking with that simplifies his life and allows him to benefit from any reward program.
Solutions to Maximize Fuel Efficiency
Malachi’s frequent trips and long hours behind the wheel mean small changes can lead to huge gains. Here is a three-pronged approach for how to increase gas mileage in a 2016 Toyota Highlander that all owners can use immediately:
Master the Art of Fuel-Efficient Driving:
- Smooth on the Accelerator: He mentioned that driving all day, which makes aggressive acceleration the biggest gas hog. Accelerating gently and gradually from a stop is crucial for maximizing fuel efficiency in your Toyota. Think of your accelerator as a sponge: squeeze it, don’t stomp on it.
- Anticipate and Coast: On the highway, use cruise control to maintain a steady speed, which is a key to great fuel economy. In city driving, practice “anticipatory driving.” Look far ahead to lights and traffic. If you see a red light, ease off the gas early and coast to the stop, allowing your momentum to carry you. This avoids unnecessary braking and re-acceleration.
- Reduce Idling: Since your Highlander is always running, if you’re stationary for more than 60 seconds (like waiting for a drive-through or a long train), turn the engine off. Idling gets you 0 MPG.
Optimize Vehicle Maintenance and Load:
- Tire Pressure is King: This is often overlooked as a way to improve a Toyota Highlander’s MPG. Check your tire pressure weekly against the pressure listed on the driver’s side door jamb (not the max on the tire sidewall). Under-inflated tires dramatically increase rolling resistance, forcing your V6 to work harder.
- Remove Excess Weight: Every 100 pounds you carry reduces fuel economy by about 1%. If your back seats or cargo area are filled with non-essential tools, boxes, or gear for your long driving days, remove them.
- Regular Service: Ensure your air filter is clean, your spark plugs are in good shape, and you are adhering to your manufacturer’s schedule for oil changes. A healthy engine is an efficient engine.
Address Aerodynamics (The Hidden Cost):
- Roof Rack Removal: If you have a roof rack or cargo box, remove it when not in use. Even when empty, a roof rack can increase drag and dramatically hurt highway MPG, where you spend a lot of time.
- Close the Windows: At highway speeds (over 40 mph), open windows create significant aerodynamic drag. Use your air conditioner sparingly for comfort, but keep windows and the sunroof closed on the highway.
Conclusion and Takeaway
Malachi’s problem isn’t a faulty Highlander; it’s the sheer amount of time he spends driving a comfortable, reliable V6 crossover that isn’t designed for maximum fuel savings like its Hybrid counterpart.
His reported 22–28 MPG is actually a strong indicator of a healthy engine and good driving habits, but those 28 MPG stretches are likely long, steady highway runs. The 22 MPG is likely when the engine is working hardest in mixed city driving.
By switching to the correct 87 octane, maintaining the proper tire pressure, and focusing on smooth driving techniques, he will be implementing the most effective ways to increase your Highlander’s fuel economy.
Key Question for Readers:
Malachi’s situation is typical for high-mileage drivers. Beyond the technical tips I’ve offered, what single, non-obvious driving habit for better gas mileage have you personally found to be the most effective in your high-mileage daily driver? Let me know in the red Add New Comment link below!
Check out my Toyota Highlander story: 2024 Toyota Highlander Owner Says, “The Dealer Just Hit Me With a $480 Diff Fluid Change At My 30K Service,” He Asks, “Is This For Real or a Dealer Scam?”
I’m Denis Flierl, a Senior Torque News Reporter since 2012, bringing over 30 years of automotive expertise to every story. My career began with a consulting role for every major car brand, followed by years as a freelance journalist test-driving new vehicles—equipping me with a wealth of insider knowledge. I specialize in delivering the latest auto news, sharing compelling owner stories, and providing expert, up-to-date analysis to keep you fully informed.
Follow me on X @DenisFlierl, @WorldsCoolestRides, Facebook, and Instagram
Photo credit: Denis Flierl via Malachi Parker
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