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18 mpg is average for my stock 2010 FJ, no roof rack. I drive on the interstate a lot so I don't see 20+ very often.

18.5 if I'm going 70
17.7 if I'm going 75
16.7 if I'm driving in the city

You can check out other people's gas mileage on fuelly . This is mine: Mr. FJ (Toyota FJ Cruiser) | Fuelly I would put the banner on my signature but this site doesn't allow two images in signature.

I saw a post not too long ago about all the things you can do to improve gas mileage.

Edit: I'm also a very conservative driver.
 

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Steel bumper, winch with synthetic line, aluminum front skid, Toyo R/T in 35x12.5R17. 149,968 miles with all synthetic oils everywhere... Looking at 15.5 avg after going to 35's with standard daily "Rural" driving with some highway time. When I added the steel bumper I went from 20mpg to 18... 35's dropped me to 15.5.
 

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Howdy everyone,

Recently with absurd gas prices I’ve been looking more closely at my fuel consumption-miles driven and have been driving more conservatively, as best I can lol. That lead me to wonder, how many miles per tank do others average in their fj. Assuming you go till the fuel light is on and fill up about 15 gallons, how many miles do you travel with 15 gallons and how many mpg? I do realize this will vary greatly as mods can easily change gas mileage in a heart beat. With that said. Im currently running 33s, about an inch lift, steel front bumper, low profile roof rack, and have done numerous upgrades under the hood. With all that I am currently traveling about 220-240 miles per tank (15 gallons) which means my mpg is between 14 and 15 mpg, sometimes higher depending on if I do more highway driving not.
looking forward to hearing what everyone else is getting with their rigs!

I have kept track of miles per gallon (MPG) my last 14 tanks of gas - similar to you I put 15ish gallons in each fill up. I always run 87 from Sam's Club unless otherwise noted below. My FJ is basically 100% stock, 2012 with Convenience package and Off-road package, 110k miles.

19.86
17.78
19.44
19.15
18.18
19.79
16.57 (camping trip - more off-roading)
19.49
19.76
20.38
16.79 (Costco gas)
17.67
18.97
19.26
 

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3,948 Posts
I have kept track of miles per gallon (MPG) my last 14 tanks of gas - similar to you I put 15ish gallons in each fill up. I always run 87 from Sam's Club unless otherwise noted below. My FJ is basically 100% stock, 2012 with Convenience package and Off-road package, 110k miles.

19.86
17.78
19.44
19.15
18.18
19.79
16.57 (camping trip - more off-roading)
19.49
19.76
20.38
16.79 (Costco gas)
17.67
18.97
19.26
Automatic I assume?
 

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6,847 Posts
Probably gonna lose some face here, but I've got to admit that I've never seen 90 on my speedo.
I`m not really sure if I`ve ever seen 80 mph on mine :) I usually cruise between 60 and 70 on the freeway. Up on my mountain I doubt I get above 45 mph
 
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What's mpg? 🤣
EXACTLY! Who cares!? You get to drive an FJ. Drive a Prius if you care about mpg. My first car was a ‘55 Packard that I got from my grandpa. It got gallons per mile. - my modded ‘14 FJ gets miles per gallon and I love it! Actually prefer it over my ‘21 Bronco. Just drive your FJ and be glad you’re lucky enough to own one!
 

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I have kept track of miles per gallon (MPG) my last 14 tanks of gas - similar to you I put 15ish gallons in each fill up. I always run 87 from Sam's Club unless otherwise noted below. My FJ is basically 100% stock, 2012 with Convenience package and Off-road package, 110k miles.

19.86
17.78
19.44
19.15
18.18
19.79
16.57 (camping trip - more off-roading)
19.49
19.76
20.38
16.79 (Costco gas)
17.67
18.97
19.26
Roof rack, or naked top?
 

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9 Posts
This is an interesting topic - I had the same issue and recently changed jobs which require me to rack up the miles. Every fill up over the last 3 months has been carefully calculated so I know how my driving affects mileage. The difference is as high as 70-80%. I have an 07, lifted, 33's, a hundred or more pound of survival gear, roof and light rack and front bumper winch, etc... definitely not aerodynamic in the slightest. The biggest difference is on the interstate.

If I do 80 on the interstate/freeway, I will average around 9.5 to as high as 10.5 MPG. at this speed I burn through half a tank or more in less than 100 miles. I live and mostly drive in extremely rural areas so have to plan accordingly or carry spare fuel to reduce range anxiety if I drive like that. I have found if I cruise at 72MPH and don't let cruise control climb the hills, I just push as gently up the hill as best as I can and will typically follow a semi or something like that depending on traffic. That will result in a consistent 17 to as high as 19 MPG - I can easily get 100-140 miles out of less than half a tank. So - I could probably get as much as 250-280 out of a full tank. Doing much less than that - like 60-65 the whole way makes almost no difference.

Its pretty easy to carry spare fuel for me now that I purchased a set of Rotopax that hang on the back tire (roughly 4 gals total). Easy to remove/add and fill if I need them or not. There are many rural stretches here as much as 70-80 miles and the next town might not have gas if the owners have gone fishing, or the family is having a wedding or something (I am not joking - that's how it works in New Mexico)

I thought about swapping or selling the FJ until I figured out the range problem was me more so than the FJ. It takes a little more time but all the anxieties went away once I just decide to chill and cruise.
 

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49 Posts
Altitude (air density) has a big effect on highway mileage because the FJ has so much wind resistance. On a recent trip from CA to TX I got better mileage at 75 mph at 4,000 feet or more than I did at 65 MPH at sea level.
 

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2013 Iceberg (stock)/AT/loaded
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57 Posts
Driving conservatively and not exceeding the speed limit, I get 18-20 mpg on a 2013 stock AT FJ with OEM roof rack on Cooper Discoverer A/T3 4S tires. On the highway (no mountains), driving the speed limit means I occasionally can see almost 21 mpg.
 
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