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Old 02-09-2021, 08:06 PM #16
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Quote:
Originally Posted by yotantexas View Post
Mountains = more coasting down hill compared to flat ground.
Also thinner air at 8000 feet so the truck calibrates how much fuel it delivers based on how much air the engine is sucking in.
But I bet your truck seems to have a good bit more pep at sea level.
Dont you drive up the same hills to get back??
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Old 02-09-2021, 09:06 PM #17
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Originally Posted by bear1998 View Post
Dont you drive up the same hills to get back??
When I worked in Colorado Springs I lived in Monument. Every day if I reset my mileage calculator, I had a drastically different mileage for driving to work, downhill, then driving home, uphill.
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Old 03-09-2021, 09:25 AM #18
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Thanks for all the replies guys. It was definitely different in Vail as there were not many stop signs or stop lights within 30 miles of my house(lots of round-a-bouts), but originally my gas mileage honestly stayed above 23mpg. I probably accelerated slower than average jumping on the interstate, and a good part of the year you are driving slightly slower in 4wd because of conditions, but remember for first few years that my gas mileage range was always above 400 miles. I would reset once a year or so sample size should have been good, and noticed mpg slowly came down to 21 over a few years. I am not 100% on the cause of the drop, but sounds like my 4runner is normal which is what I cared about. I am now getting 17.3 in solo suburb driving and if you guys say that is normal, then that is exactly what I was looking for. A few people in the mountains use to say that diesels were a lot more efficient at altitude. On my dirt bike, I typically was up above 9000' and had to put much smaller jets on it because when there is less air for a carb, the engines run too rich, but I always assumed that even with the proper air/gas ratios the engines just would simply not perform as efficient.

I love Toyotas because they are just so reliable. I also had a TRD truck up there with 275k miles that ran perfectly fine when I sold it, but now starting to think about getting one of these new Broncos. Just need a convertible again after living in the mountains for 14 years, and really wish Toyota would bring back the old FJ40s where you can take the top off again.
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Old 03-09-2021, 01:13 PM #19
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My anecdotal experience -- I gained 1-2 MPG moving from Dallas to front range Colorado. In Dallas I'd be averaging 16-17 and in CO I'm seeing 17-18 average over the last few months.
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Old 03-09-2021, 01:20 PM #20
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Quote:
Originally Posted by bear1998 View Post
Dont you drive up the same hills to get back??
I haven't scientifically proven this, but in my experience, if you keep the speed lower on the climb up, the fuel savings when coasting down can offset the increased fuel need on the climb up.

For example, when approaching Loveland Pass on I70, I am typically at around 55-60 mph in the right lane. If I were to try and keep up with traffic doing 65-70, my FE would tank. When coming down, I'm usually in 4th and able to maintain speed. At this point there's no fuel being fed at all, given RPMs are high enough for the ECU to shut fueling off. Driving like this I get marginally better fuel economy in the mountains than I do on I25 doing 65-75. I'm sure some of that has to do with the speed in the mountains being lower as well.
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Old 03-09-2021, 01:44 PM #21
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Since you noticed a "change", I would suspect a maintenance item might be to blame.

Simple things like air filters and plugs. Dirty fuel injectors. Dirty MAF and/or throttle body (both easy to clean). Bad o2 & F/A sensors. Tire inflation pressures, etc.

More complicated things like wheel bearings, brake drag, etc.

I get 19.3 everywhere. It dipped a little when my throttle body was dirty and when I ran lower tire pressure.
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Old 03-09-2021, 09:03 PM #22
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Quote:
Originally Posted by Jivewalker View Post
Since you noticed a "change", I would suspect a maintenance item might be to blame.

Simple things like air filters and plugs. Dirty fuel injectors. Dirty MAF and/or throttle body (both easy to clean). Bad o2 & F/A sensors. Tire inflation pressures, etc.

More complicated things like wheel bearings, brake drag, etc.

I get 19.3 everywhere. It dipped a little when my throttle body was dirty and when I ran lower tire pressure.


FPNI, start with basic maintenance and a little love.

Change oil, air filter, clean MAF, throw a bottle of BG/Techron/etc in the tank, and most of all—sparkplugs. And spring for the double iridium ones while you’re at it.

That’s all I got
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Old 03-09-2021, 09:25 PM #23
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Gas mileage Is definitely more efficient at altitudes, that's probably 90% of your "problem," if not all of it.

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Old 03-10-2021, 08:58 PM #24
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OP, you did not clarify where at sea level you are at.
But I am with Electro Boy on this. Being from SoCal our fuel blends change from winter to summer. (AQMD rules) this effects MPG.
I also agree with adding or buy fuel that contains Techron to keep your injectors clean. I have done this for years and believe that it works.

I am not familiar with Colorado fuel but do they have season blends for there gas? I have been to Denver and if they don't they should.

Ethanol added to gas helps with emission but it hurts MPG.
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Old 03-11-2021, 07:17 PM #25
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Sounds like you are getting about the same mileage as everyone else, I don't see much to worry about.
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Old 03-11-2021, 08:14 PM #26
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You are currently getting just about dead on overall EPA stated mileage for the vehicle. I don't see a problem.
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