I did not know that. Then yes I want to change the air/fuel sensors.
I know, another Poor gas mileage thread.
- Thread starter mizak82
- Start date
cleaned throttle body.. was kind of dirty not too bad, but felt a slightly smoother acceleration from it... but mileage was 16.25 per gallon on this tank..
idk guys, that still doesn't seem right... its a V6 in florida.. its rated 17/20 from factory.. the lieometer always says 18.5.. is that what people always quote saying they get that for gas mileage?
It is a sport so maybe the fake hood scoop, tubes, spoiler are hurting its mpg compared to others..
idk guys, that still doesn't seem right... its a V6 in florida.. its rated 17/20 from factory.. the lieometer always says 18.5.. is that what people always quote saying they get that for gas mileage?
It is a sport so maybe the fake hood scoop, tubes, spoiler are hurting its mpg compared to others..
LTDSC
New member
if you're seeing 16.5 hand calculated with correct speedo/odo. you're doing just fine.
My MPG gauge is ALWAYS exactly 2 MPG higher than actual. Mine reads anywhere from 18.1 to 18.6 for normal tanks (non-road trip) and I get 16.1 to 16.6 mpg actual.
On a side note, I always assumed that because my truck is stock and my tires are stock size that the tires themselves wouldn't have much of an impact on mileage. I just replaced my year-old BFG Rugged Terrains with a set of Nitto Terra Grappler G2s in the same size and I get a full 1 mpg better with them than those crappy BFGs that I had to warranty out since they were such crap.
Mine is the same as well in my 04 V6. It always reads avg 17mpg and by hand every time it comes out to 15.5, I've just learned to accept it. I also run 265/70/17 Duratracs and a 2" front daystar spacer lift.
Porqupine82
New member
I've got a lift and 33s, and I'm getting 19 exactly by the computer, and 17.8 when calculated by me. My driving is 100% highway/ interstate. Less than 5 miles in town driving a week.
I don't want to start a new thread for what could be an easy question, but I'm having trouble with the upstream air/fuel sensors.
Who here has replaced them on a v6? I haven't really tried the passenger side, but the driver's side is cramped as hell and I have no idea how to get enough room for a wrench. Even with my somewhat skinny arms I can barely reach down there. Going from underneath is better, but not enough.
I searched and there's no clear instructions for v6. Everyone sort of glosses over the process. The only remotely helpful post I found was to take off the wheel and wheel liner and go in that way, but I checked and even that seems tough.
Either that or get a plain ol' wrench and a really long cheater bar and go 1/4 turn at a time.
Who here has replaced them on a v6? I haven't really tried the passenger side, but the driver's side is cramped as hell and I have no idea how to get enough room for a wrench. Even with my somewhat skinny arms I can barely reach down there. Going from underneath is better, but not enough.
I searched and there's no clear instructions for v6. Everyone sort of glosses over the process. The only remotely helpful post I found was to take off the wheel and wheel liner and go in that way, but I checked and even that seems tough.
Either that or get a plain ol' wrench and a really long cheater bar and go 1/4 turn at a time.
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Billynath1988
Senior Member
I have the v8 so the clearance around the 02 is probably slightly different, however Harborfreight sells a cheap 02 sensor socket that is offset, if you can snake that up there and get a ratchet on it you should be good.
3/8" Offset Oxygen Sensor Wrench
Sadly, I already have one like that. I'll keep trying on it.
I was trying to do it without jacking it up first, so I haven't done the wheel well with the wheel off yet.
It's pretty easy to get to when you remove the wheel and splash guard. I'd go at it from that direction if I were you.
I think my problem may have been caliper related after all. The grease was gunky and a little sticky. I know the on-board MPG is trash, but after I cleaned and greased the front driver caliper, it's gone from 13.9 - 15 MPG (over the past few weeks) to 19 - 20.5 MPG today. Going to do the passenger side later.
I did change my spark plugs, but there's no way they made that much difference.
So the big question is, do I still bother to replace my air/fuel sensors? I'm starting to think they're fine, but at 175k miles, should I just do it or save the $150?
I did change my spark plugs, but there's no way they made that much difference.
So the big question is, do I still bother to replace my air/fuel sensors? I'm starting to think they're fine, but at 175k miles, should I just do it or save the $150?
Reviving this thread for a second...
Does the ECU flash from the recall have any affect on MPGs?
I had my dashboard replaced a couple weeks ago and they flashed the ECU without asking or notifying me. Anyways, since then my MPG gauge shows 14-16, where perviously it was 18-20.
I haven't done a calculation by hand yet, but wondering what you guys think. Not sure if the ECU has to "calibrate" after the flash or something.
Does the ECU flash from the recall have any affect on MPGs?
I had my dashboard replaced a couple weeks ago and they flashed the ECU without asking or notifying me. Anyways, since then my MPG gauge shows 14-16, where perviously it was 18-20.
I haven't done a calculation by hand yet, but wondering what you guys think. Not sure if the ECU has to "calibrate" after the flash or something.
geurillawarfare
New member
In regards to the dash computer - There are a couple V8's in my family and I think the dash just lies. Always has, always will. My theory is that it's related to the way they handle averaging during coast. The computer is sampling a number of readings and doing some math for distance traveled divided by fuel used per unit of time. When coasting, your traveled distance per time unit is rather high, and your fuel consumption per time unit is very low. However, I'll bet darn near anything that during the coasting, the yoda is assuming way too close to zero for fuel consumption. Like, near divide by zero (which equals infinity!), and this is used for the average just like any other driving condition. This artificially inflates the measurement.
I have noticed that some other cars (audi for example) do not do this for a true coast condition, nor for a true idle condition. Instead, they seem to go into some sort of "low fuel consumption" mode where the math is different and doesn't have a big effect on the average (like the toyota). I have an audi A6 that always calculates within 5% of my actual fuel usage.
In regards to economy in general -
Different types of fuel will have some effect, I would assume that a higher octane fuel will provide slightly better fuel economy, especially in hot climates.
If in doubt, check all the critical parameters - look at your spark timing, fuel pressure, critical engine sensors under load. If you have a friend with an identical T4R with same emissions standard, do a comparison.
I have heard rumor of the additives in some fuel causing restriction in the little thimble filters that are in the input of every fuel injector. This could result in poor fuel atomization, which would cause a number of problems including reduced fuel economy. There are lots of guys who do fuel injector cleaning, so if you can find one nearby, it's always possible to pull your injectors and have them flow and spray pattern tested.
If everything checks out - I think it might be possible that our trucks might just be really thirsty, all the time. Keep in mind that our fuel tanks are small and even a slight difference in level might result in a different top-off volume. For best results during fuel economy trials, always refuel at the same fuel pump, with the tires in the same spot, at the same ambient temperature, with the same pretty attendant at the cashier counter.
I have noticed that some other cars (audi for example) do not do this for a true coast condition, nor for a true idle condition. Instead, they seem to go into some sort of "low fuel consumption" mode where the math is different and doesn't have a big effect on the average (like the toyota). I have an audi A6 that always calculates within 5% of my actual fuel usage.
In regards to economy in general -
Different types of fuel will have some effect, I would assume that a higher octane fuel will provide slightly better fuel economy, especially in hot climates.
If in doubt, check all the critical parameters - look at your spark timing, fuel pressure, critical engine sensors under load. If you have a friend with an identical T4R with same emissions standard, do a comparison.
I have heard rumor of the additives in some fuel causing restriction in the little thimble filters that are in the input of every fuel injector. This could result in poor fuel atomization, which would cause a number of problems including reduced fuel economy. There are lots of guys who do fuel injector cleaning, so if you can find one nearby, it's always possible to pull your injectors and have them flow and spray pattern tested.
If everything checks out - I think it might be possible that our trucks might just be really thirsty, all the time. Keep in mind that our fuel tanks are small and even a slight difference in level might result in a different top-off volume. For best results during fuel economy trials, always refuel at the same fuel pump, with the tires in the same spot, at the same ambient temperature, with the same pretty attendant at the cashier counter.
nevada
Senior Member
was it reading lower, immediately after it up from the dealer?
if so, they were probably out rodding the shit out of it on the "test drive".
Everything was reset (trip miles, avg mph, mpg) so the mpg reading was starting from scratch. No idea how that test drive went but i wouldnt be entirely surprised.
Seriously. Sometimes I wish I would have bought a v8 because I often get v8 gas mileage.
TeamLord
New member
That's why we bought a new Tundra instead of a new Tacoma, more truck, more power and sometimes better or the same MPG. There is a drawback though- the Tundra is too huge to fit on the trails around here.
