How good is your gas mileage?!

[AnyMal]

Off road/even gravel - yeah, it's tough on fuel. My conditions weren't magical however. It was a round trip. With all those stops. The only favorable factors were no or, little wind and it was only me in the vehicle. I confess to driving the speed limit (or close) - I hate the hassle/cost of tickets. without the stops I would have been over 21 for sure. I just wonder if my "break in" drive of 900 miles straight may have somehow been a factor. I have no other explanation. I use the lowest octane fuel available, mostly from Costco. To be fair when the wife drives around town; the numbers are kinda depressing. About what my LX 450 gets.

Ahh 65mph? True, we need to standardize our methodology lol. I tend to cruise at 70 and 80 if its clear. Every MPH after 65 is a tragedy for efficiency haha

 

[gluaisrothai]

I’m typically getting about the same fuel economy as my LC gets in my 3600lb max gross six seater airplane at 180mph. 13.1 nautical miles per gallon, or 15.1 mpg. Engine is a TIO540 AH1A, running lean of peak. That’s a nine liter flat six designed in the seventies.

My fuel costs for the round trip CA-TX are almost exactly the same in the airplane and the LC-$1100- but the time is different by a factor of 3.

 

[MRego]

Follow up to my last post. Did a trip yesterday/today 233 miles. Stopped for: Dinner, Hotel, Breakfast, Visit to Client & Lunch, includes stoplights, etc.
Driving stock tires (Dunlops @ ~ 35PSI). I can't complain - except about CA fuel prices
View attachment 2898521

Not sure how you guys are getting these mpgs. Granted I am running ko2s 285/65/18 and coil spacers. These are the only two "mods" to my 2018 base truck and I can't seem to get more than 15.8mpg. I am only using regular gas. Would premium increase my mpgs? My ECT is off all the time too. Should I turn it on?

 

[bloc]

Not sure how you guys are getting these mpgs. Granted I am running ko2s 285/65/18 and coil spacers. These are the only two "mods" to my 2018 base truck and I can't seem to get more than 15.8mpg. I am only using regular gas. Would premium increase my mpgs? My ECT is off all the time too. Should I turn it on?

I went from consistent 17-18mpg tanks at 73mph on stock tires to barely 15 when I switched to your exact tire and spacer setup at 42psi. Those tires just aren't efficient, between being taller and LT tires vs p-metric. Note that extra friction within the LT tire is the primary reason they need higher pressures to support the same load... even with more pressure there is increased friction seen as rolling resistance, and this will use some amount of fuel.

Premium may help, but if so it'll be barely noticeable. Most likely not enough to be worth the extra money at the pump.

Unfortunately there isn't much you can do other than go back to a p-metric tire construction, and that setup has drawbacks of it's own.

 

[beer]

16.05 mpg average over 17,609 miles in the last 9 months with LT285/75R17

 

[manofthewoods]

Not sure how you guys are getting these mpgs. Granted I am running ko2s 285/65/18 and coil spacers. These are the only two "mods" to my 2018 base truck and I can't seem to get more than 15.8mpg. I am only using regular gas. Would premium increase my mpgs? My ECT is off all the time too. Should I turn it on?

I buy the LOWEST octane fuel, usually from Costco. Higher octane doesn't produce more power unless compression is high enough for pinging or detonation. LC's are conservatively designed to not need high octane. Now, if we're talking ethanol free, that's a whole 'nuther can of worms

two big factors...
1) efficiency of vehicle, (or lack thereof in the case of LC's)
2) efficiency of driving: High speed, fast starts, hard stops, etc. all make a big difference on a beast like our LC's

doesn't mean I like it. Don't shoot the messenger

 

[bloc]

I buy the LOWEST octane fuel, usually from Costco. Higher octane doesn't produce more power unless compression is high enough for pinging or detonation. LC's are conservatively designed to not need high octane. Now, if we're talking ethanol free, that's a whole 'nuther can of worms.

two big factors...
1) efficiency of vehicle, (or lack thereof in the case of LC's)
2) efficiency of driving: High speed, fast starts, hard stops, etc. all make a big difference on a beast like our LC's

doesn't mean I like it. Don't shoot the messenger

I would struggle to find the thread but there is some data to suggest the 3UR tune used in the cruiser and LX has the ability to trim timing in response to octane, but the difference doesn’t seem to overcome the increased cost at the pump.

Also, all things considered the stock mileage of a LandCruiser is pretty impressive, given what we get. 380+hp, AWD, pretty big, really impressive off road, etc. They did great things with the stock aero package and engine.. all we need to do is compare it to 80 or 100-series fuel efficiency to see there were significant gains. And, when people add racks and bumpers mileage quickly suffers because those mods upset the careful stock aero profile.

But ultimately you are right. There is only so much you can do with something in this category..

 

[MRego]

Thanks guys. Yes. Looks like with ko2s I am stuck with this mpg. But they look so much better than stock that I am willing to fork the extra cash. Actually my employer pay for my commute gas, so even better. I will however fill up a tank of premium and compare to see if any difference. Will report back.

 

[gluaisrothai]

Thanks guys. Yes. Looks like with ko2s I am stuck with this mpg. But they look so much better than stock that I am willing to fork the extra cash. Actually my employer pay for my commute gas, so even better. I will however fill up a tank of premium and compare to see if any difference. Will report back.

I think the looks are definitely better, but I have so much confidence in those tyres after running them for 80k on my FJ- that is worth so much more.

 

[Itsky]

Not sure how you guys are getting these mpgs. Granted I am running ko2s 285/65/18 and coil spacers. These are the only two "mods" to my 2018 base truck and I can't seem to get more than 15.8mpg. I am only using regular gas. Would premium increase my mpgs? My ECT is off all the time too. Should I turn it on?

I use 91, it works for me. I also don’t find ECT to reduce MPG at all, I like the way it drives, so I use it most of the time. Are you judging your mpg off what the computer says? (If so, use gps to compare your ODO to find your conversion, mine is +5%, so my ODO says 100 and I’ve gone 105) Are your tires E rated?

 

[bloc]

Thanks guys. Yes. Looks like with ko2s I am stuck with this mpg. But they look so much better than stock that I am willing to fork the extra cash. Actually my employer pay for my commute gas, so even better. I will however fill up a tank of premium and compare to see if any difference. Will report back.

It seems to take a number of tanks for the ecu to adjust the timing in relation to the extra octane. So I’d say if it is something you want to experiment with maybe try giving it a month and comparing careful notes.

You may also notice the truck feeling more peppy (best word I can come up with.. not so much faster, but more responsive and “sharper”) over time. Thing is it’s a gradual process so hard to say it’s night and day.

 

[MRego]

I use 91, it works for me. I also don’t find ECT to reduce MPG at all, I like the way it drives, so I use it most of the time. Are you judging your mpg off what the computer says? (If so, use gps to compare your ODO to find your conversion, mine is +5%, so my ODO says 100 and I’ve gone 105) Are your tires E rated?

That’s a good point. I am purely relying on what the car says. Yes, those tires are E rated. I knew that when buying and consciously did so for the added strength against punctures for an upcoming trip to the Death Valley. The Waze gps always shows me 1 mile per hour above what the car says. I would not know how to calculate how many, but probably I am getting more miles than what the car shows.

 

[bloc]

That’s a good point. I am purely relying on what the car says. Yes, those tires are E rated. I knew that when buying and consciously did so for the added strength against punctures for an upcoming trip to the Death Valley. The Waze gps always shows me 1 mile per hour above what the car says. I would not know how to calculate how many, but probably I am getting more miles than what the car shows.

Stock dunlops are 663 revs/mile, 285/65r18 KO2s are 639

663/639= 1.04, or the factor you can multiply your odometer reading by to adjust for the different diameters.

Another way of saying it is your mileage is 4% better than reported by the computer. Not a huge change.

Manufacturers often have speedo readings that over report speed slightly even on stock tires, so they aren’t a good example of how to adjust for changes.

 

[Itsky]

Stock dunlops are 663 revs/mile, 285/65r18 KO2s are 639

663/639= 1.04, or the factor you can multiply your odometer reading by to adjust for the different diameters.

Another way of saying it is your mileage is 4% better than reported by the computer. Not a huge change.

Manufacturers often have speedo readings that over report speed slightly even on stock tires, so they aren’t a good example of how to adjust for changes.

Good stuff!
in my case, when I added 285/70/17 bfg s the odo shows 100, I’ve gone 105, and the speedo is almost dead on. Test it with a gps unit on a long highway run.

 

[bloc]

Good stuff!
in my case, when I added 285/70/17 bfg s the odo shows 100, I’ve gone 105, and the speedo is almost dead on. Test it with a gps unit on a long highway run.

That or a long stint on an interstate or something with clear mile markers compared to the odometer or trip meter are the other ways. My method assumes the tire spec sheet is accurate on rev per mile, which isn’t a safe assumption given how inaccurate their other dimensions can be. Especially when comparing one manufacturer to another.

 

[kcjaz]

Manufacturers often have speedo readings that over report speed slightly even on stock tires, so they aren’t a good example of how to adjust for changes.

Yep. Definitely true for the LC. The odometer and speedo are “calibrated” differently. With stock tires the odometer reading will be accurate and so will the calculated milage but your speed will read low by about 5%. I read somewhere that it is this way because of some kind of law in Japan. Don’t know if that’s true or not. When you go up a tire size your speedometer will read pretty close to correct but now your odometer will read about 5% wrong and so will the calculated mileage.

 

[MRego]

Stock dunlops are 663 revs/mile, 285/65r18 KO2s are 639

663/639= 1.04, or the factor you can multiply your odometer reading by to adjust for the different diameters.

Another way of saying it is your mileage is 4% better than reported by the computer. Not a huge change.

Manufacturers often have speedo readings that over report speed slightly even on stock tires, so they aren’t a good example of how to adjust for changes.

Got it. So, if my reading in the odometer is 300miles, it is actually 312miles. Hey, it is not much but I will get anything extra that translates to better mpg.

 

[AnyMal]

With big enough tires, you can keep your odometer from ticking!

 

[Angelo1]

Has anyone tested to see if they noticed a big difference using 100% gasoline? We have a couple stations in my area that offer this but the price is similar to Premium. Not sure if it’s worth the cost difference.

 

[AnyMal]

Has anyone tested to see if they noticed a big difference using 100% gasoline? We have a couple stations in my area that offer this but the price is similar to Premium. Not sure if it’s worth the cost difference.

Ive been meaning to go to murphys for 2 years. Lol

You got a lot of sunoco in houston too.