Hybrid Real World MPG (iForce Max) - post your model, specs, general driving conditions, results:

[gavinman]

TRD ORP, normal mode, 70/30 mix highway/city/ 93 Octane, 14.5K miles:

With 67# 285/75 Toyo A/T III on TRD Flat black option wheels:
- Average over ~6.5K miles: ~17.5 MPG (with odo adjustment for tire circumference difference (6.75%)
With 37# 265/65 Mich Trails (OEM) on TRD PRO wheels:
- Average over ~8K miles: ~21.5 MPG.

I've reported these rough numbers before but came here today because my most recent data is interesting and reflects some new conditions:

- Towing ~1500# loaded flatbed trailer - OEM tires ~400 miles: ~15 MPG!
- 870 mile highway trip (VA-GA-VA) with ~10 miles in LO4 off-road - Big tires: 19.4 MPG! (best ever on the big tires)

So towing is rough on gas milage - guess that should not be a surprise. And I guess my observation about the longish highway trip with the big heavy tires is that once you get those heavy tires turning they want to keep turning. almost 19.5 MPG is more than acceptable to me with those tires. (Am guessing that same trip on OEM tires would have been ~22-23 MPG)
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what did you use to calibrate the new size tires?

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[MikeD]

Ratio of tire diameter from manufacturer specifications. calculated and tracked by spreadsheet at every tank fill/tire swap. Speed delta verified with gps

 

[Joestac]

Trending back up since swapping to the 275/70/18 Toyo Open Country AT3 in an E load at 50 pounds each. 18.57 over the last 300 miles. These are lighter than both the KO3 and the AT4W. A smarter man would have switched straight to these tires, but now I know firsthand how each drives.

 

[Oldhoosier]

23.9 avg. for last 1,500 miles. Mostly non-freeway, side roads, state highways, etc.

Basic, non-modified vehicle, 87 octane gas. 6,000 miles on vehicle. Mileage has increased noticeably with warm weather and having a few more miles on the vehicle.

 

[SouthCoast]

22+ in normal as usual. 24+ on the highway is pretty easy.

 

[ifunlisted]

Slowly climbed to 18.5mpg after appx 5,000 miles. I went from 31.5" tires to 32.6" so I think (think) that throws off the calc and the actual mpg is closer to 21mpg. Tire/wheel setup is larger but appx 20lbs lighter overall. Skid plate added (24lbs), air dam removed. 50/50 mix of city/hwy but I tend to drive a little more aggressive than avg and a little faster on the Hwy. At some point I'll need to track using actual mileage and gas receipts but the tire size also affects the speedometer and odometer. It seems kind of silly that this can't be recalibrated by the dealer since there are multiple tire sizes for the same vehicle... for all intents and purposes related to mileage, my Platinum is now a TRD OffRoad. Or are all the OffRoad models on stock 265/70/18 tires slightly off (speed reads appx 3% faster than actual)?

 

[MikeD]

It seems kind of silly that this can't be recalibrated by the dealer since there are multiple tire sizes for the same vehicle... for all intents and purposes related to mileage, my Platinum is now a TRD OffRoad. Or are all the OffRoad models on stock 265/70/18 tires slightly off (speed reads appx 3% faster than actual)?

THIS is an excellent point. And yet we have no indication that such a calibration is possible. Baffling.

Re: your questions:
On my TRD OR I run stock 265/70R18 (32.6") some of the time and 285/75R18 (34.8") for winter and off-roading (or prepping to).

I compare my speed on the dash with the reading from my Wolfbox GPS when at constant speed on an open highway. With stock the dash speed is generally the same but sometimes (20%??) 1 mph higher. So I think my speedometer is calibrated just a bit high. (<.2% - nowhere near 3% per your hypothesis).

Therefore, I assume that the calibrations are different by trim. And this is why I'm baffled that recalibration is (apparently) not possible.

When running the larger tires, the GPS speed is always a few MPH higher than dash - consistent with what one would expect. So I calculate my MPGs by assuming odometer is correct (even though I believe its just a bit high) and adjust the miles when the big tires are on by the ratio of the tire sizes (*1.0675)
I'm at 19.45 MPG overall for ~16K miles. A bit less than 18 for large (&HEAVY) tires; A bit less than 22 for stock, with similar total miles for both (~8K each)

 

[ifunlisted]

That's great info! I'd be curious to compare with other 6g owners running larger tires. I was definitely hoping for more than 18.5 mpg so thats why I'm trying to see how the numbers might be affected by the tire size. I had the bigger tires installed before I ever drove the vehicle so I never had a chance to check the speedometer accuracy but I've read that Toyota sets them slightly higher in trucks and SUVs knowing that a lot of them will get bigger tires. Right now, if my speedometer says 60, my actual speed is 58... if 80, actual is 77.

 

[Joestac]

Last 4 fills on 275/70/18 AT3 E Loads, (18.34-19.21-19.12-17.47), averages over about 1000 miles. Some of those drives were carrying a mountain bike on the back with a Thule T2 Pro hitch rack.

 

[ifunlisted]

Last 4 fills on 275/70/18 AT3 E Loads, (18.34-19.21-19.12-17.47), averages over about 1000 miles. Some of those drives were carrying a mountain bike on the back with a Thule T2 Pro hitch rack.

I think I'd be happy with that with Es. Is that based on the dash gauge or are you doing the math manually? Also curious about the speedometer calibration on the Trailhunter... was it accurate with stock and how is it now with the 275s?

 

[MikeD]

I had the bigger tires installed before I ever drove the vehicle so I never had a chance to check the speedometer accuracy ...
Right now, if my speedometer says 60, my actual speed is 58... if 80, actual is 77.

This seems odd to me. Bigger tires should lead to higher actual speed vs dash. (speedometer is counting revolutions: bigger diameter tires = fewer revolutions for same distance).
Once again, I'm baffled.

And if the speedometer is that for off it means the odometer is too, so no (easy) way to really track MPGs accurately. I wonder if the vast differences in milage experience that we see reported on this thread might be related to speedometer/odometer (mis)calibration??

BTW - its the increase in tire weight that really lowers the ACTUAL MPGs - affects total mass and (even more impactfully, I believe) rotational mass that the engine needs to move.

 

[Joestac]

I think I'd be happy with that with Es. Is that based on the dash gauge or are you doing the math manually? Also curious about the speedometer calibration on the Trailhunter... was it accurate with stock and how is it now with the 275s?

I am very happy with that on E loads. They are 50 pounds each over the stock 39. Speedo, I actually have no clue. I've never really cared about it. I don't ever speed more than 5 over. I can run Google Maps on the way home and see how it compares though. I calculate with the FillUp app, I don't trust the dash computer.

 

[ifunlisted]

This seems odd to me. Bigger tires should lead to higher actual speed vs dash. (speedometer is counting revolutions: bigger diameter tires = fewer revolutions for same distance).
Once again, I'm baffled.

And if the speedometer is that for off it means the odometer is too, so no (easy) way to really track MPGs accurately. I wonder if the vast differences in milage experience that we see reported on this thread might be related to speedometer/odometer (mis)calibration??

BTW - its the increase in tire weight that really lowers the ACTUAL MPGs - affects total mass and (even more impactfully, I believe) rotational mass that the engine needs to move.

That's a really good point. If that's the case, the factory calibration is a significant difference. I'm just using Google Maps, so it's not 100% accurate but the speedo has consistently displayed 3-3.5% faster than GPS since day 1. Maybe GPS through Google is also off a little.

 

[Joestac]

That's a really good point. If that's the case, the factory calibration is a significant difference. I'm just using Google Maps, so it's not 100% accurate but the speedo has consistently displayed 3-3.5% faster than GPS since day 1. Maybe GPS through Google is also off a little.

Fwiw, set cruise for 55 and Google Maps tracked dead on for a while cruising down the road. If we are calling Google Maps accurate then I suppose I just by chance happen to have a speedo that is still accurate.

 

[John2112]

3 fills with 265/70/18 E load Falken Wildpeak AT4Ws, 57.2 pounds each.

93 octane, 18.05, 18.05, and 17.43. About 500 miles in total.

You're using premium fuel? Is your engine knocking? You don't get better gas mileage from premium.

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