Hopeless Diamond
New member
OK, so how does everyone log miles (or KM) traveled? Once you change tire diameter it throws the speedo/odometer off.
Gas Mileage Stump
- Thread starter aidanyota
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JohnOfTheJungle
Member
Going from 265/70 r16 to 265/75 r16 I multiply miles traveled by 1.03 because the tire is about 3.3% taller
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Hopeless Diamond
New member
thats my point, I doubt everyone is doing that each time they calculate mileage
Lindenwood
New member
I'll do you one better! I used a GPS to measure the actual distance traveled after my odometer showed 100 miles. Then, I used that to derive as the odometer's coefficient for all MPG calculations (for me, it was originally [Odometer*1.080]).
On the 2016, it was 1.040.
Hopeless Diamond
New member
I have a Kenwood DNX Nav system in my truck. It will track the miles traveled and then you input the fuel used and give presumably accurate mileage, keeping track of tanks and overall mileage. I put a Joying headunit in the 4runner, not sure it has that though it would be nice to see. Good idea on doing a comparison to miles on the odo to GPS of some sort to get the multiplier.
Lindenwood
New member
I would like to see one on a dyno. My observations consistently look like the engine is trying to maintain above-idle RPMs when throttle is cut, as if the ECU was programmed to "ease" down to idle to minimize any abruptness when letting off the gas.
I have a lot of experience "hypermiling" vehicles, consistently averaging ~30-40% more MPG than advertised (30mpg in my S10, 43ish in my Honda Fit, and 23-24 in my wife's 5th gen, all mixed). Specifically, after a lot of careful observation, most of those gains come from maximizing time spent coasting. Unfortunately, in my 3rd gen, initial indications are that some aspect of the engine management appears to obviate this benefit by temporarily increasing idle when the vehicle is still moving.
Thoughts?
*edit*
I guess I am not the only one who has noticed this.
https://www.tacomaworld.com/threads/hanging-rpms-while-coasting-in-neutral-clutch-pushed-in.344873/
https://www.tacomaworld.com/threads/slow-to-return-to-idle.297951/
Some folks have mentioned a possible TPS issue (though their symptoms seemed a bit more erratic), and others have described in various ways that it is intentional in the programming.
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Lindenwood
New member
On a separate note, it is worth mentioning that +/- 20% from average is not atypical, based simply on driving habits. As mentioned above, my wife gets 18.5-19 mpg mixed, and in the same conditions I'll get 21-24 depending on how hard I'm trying to drive efficiently.
19963.4lsr5
New member
Both Saturns I've owned or own (one automatic and other stick) hold RPMs at 1100 until a complete stop. My Saturn averages 43-45mpg per tank.
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SpidermanGeek
New member
Lindenwood
New member
#HypermilerAward!
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phattyduck
Elite Member
If you have an auto, it is the torque converter holding RPMS up - and the ECU preparing to go back into gear if you are in neutral. It is fairly normal to idle high while moving.
Even my old Camry (5-speed, '95 JDM 3s-gte swap) does the high idle while moving. It idles around 1100 rpm if moving and 675/700 when stopped (headlights off/on). The transition when coming to a stop is visible on the tach - it drops 50rpm at a time at around 1/2 second increments.
If you aren't going to be doing engine-off coasting, I'd suggest that coasting in gear will get you full fuel-cut until around 1500 rpm when fuel gets turned back on. With the gearing of the 4Runner, this doesn't actually get you much true coasting, but it is what it is... The transmission and ECU just weren't designed to eek out MPG's.
-Charlie
Lindenwood
New member
That matches everything I have experienced and come to understand! Indeed, for normal city driving, I instantly see 1100-1200rpm when letting off the gas. Switching into neutral results in almost no change.
Thanks!
