- First Name
- John
- Joined
- Mar 22, 2021
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- Location
- Charleston SC
- Vehicle(s)
- 2021 Bronco 4dr OBX MIC 2.7 Rear Locker A51 Roast
- Your Bronco Model
- Outer Banks
- Thread starter
- #1
I've owned my 2021 Outer Banks 4dr Bronco since October 21, 2021, and as of March 11, have put 6148 miles on it, in all road conditions. I've averaged 19.9 MPG, and 22.5 on a recent long highway trip returning from Nags Head. I was finally able to off-road the vehicle on the Outer Banks this week, adding that experience, and that entire trip, in the middle of a war in Europe and spiking gas prices, makes this a good time for discussing fuel efficiency over the various models and trims. It is my hope that others will post similar reports so that future buyers will have a more accurate understanding of fuel-efficiency trade-offs in new models (e.g., Raptor) as tires get bigger, axle ratios get lower (higher RPM can mean lower MPG) and drivetrain components get heavier. Published estimates indicate that Sasquatch Broncos get lower MPG than non-SAS models like my OBX. But what are the real life numbers?
My vehicle has the 2.7 Ecoboost with the upgraded transfer case, 10 speed Auto Transmission, 4 dr & MIC hardtop, stock 32" tires (255/70R18) and a rear differential locker. That means the axle ratio is 4.27, lower-geared than the 3.73 standard axle on the OBX. Lower gearing gives more torque off road, but the RPM increases, likely yielding worse Miles per Gallon (MPG).
For comparison, after the 3.73 and 4.27 mentioned above, the 33" tire Badlands has 4.46 ratio axles, and the 35" tire Sasquatch has 4.7 ratio axles. Since the ratio lowers as tire size increases, you might think it all evens out. But not according to reports. My goal is real numbers from real users.
I've posted some figures below. Generally, 65 MPH Highway trips get 22 MPG, and 75 MPH Interstate trips get 20 MPG, which also tends to be my overall mileage on long trips.
My vehicle has the 2.7 Ecoboost with the upgraded transfer case, 10 speed Auto Transmission, 4 dr & MIC hardtop, stock 32" tires (255/70R18) and a rear differential locker. That means the axle ratio is 4.27, lower-geared than the 3.73 standard axle on the OBX. Lower gearing gives more torque off road, but the RPM increases, likely yielding worse Miles per Gallon (MPG).
For comparison, after the 3.73 and 4.27 mentioned above, the 33" tire Badlands has 4.46 ratio axles, and the 35" tire Sasquatch has 4.7 ratio axles. Since the ratio lowers as tire size increases, you might think it all evens out. But not according to reports. My goal is real numbers from real users.
I've posted some figures below. Generally, 65 MPH Highway trips get 22 MPG, and 75 MPH Interstate trips get 20 MPG, which also tends to be my overall mileage on long trips.
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