Need Help with my MPG

[sequoiasoon]

Originally Posted by maddogsvolusia

I just replaced all 4 of my O2 sensors trying to get out of the mixed driving 13s in my 2wd with 265/70/17 Bridgestone Revos. (The front Driver's 02 was a nightmare by the way! Galled threads had to be destroyed and retapped!) Anyway, no improvement. I use a K&N air filter, Synthetic oil, and recently tried NGK V-groove plugs. I also run Primrose injector cleaner in every 3000 miles. I keep the tire pressure at 38 to 40 PSI. My next step is synthetic in the transmission and differential. I seem to have plenty of power, I just can't break 13 mpg in mixed driving or 15 mpg highway. It's not terrible for how nice it rides and all the space, I would just like to do a little better. My 12 gallon car can drive farther on a tank of gas than my 26 gallon Sequoia. hehehe

Your "larger tires" are adding to what you see. Check Tire size calculator you are actually off by 3.4% so you might actually be getting at least .5 more mpg (still sucks). Read some of the threads regarding the K&N and decide accordingly. Your MAF might be contaminated from the oil. It's a crazy cycle but here goes, your K&N flows more air (and dirt) and possibly gets oil on the MAF. MAF does not register airflow correctly, more air makes truck lean, O2 sensors see lean condition and richen mixture accordingly to compensate, extra fuel drops mileage as you see it, extra unburned fuel also heats up 02 sensors more possibly damaging them and the next step downstream the cats (as happened to at least 1 member).

YMMV so read the threads and decide accordingly. My self I had problems with the K&N doing exactly that, caused lean condition and ping as well as my used oil analysis showed a BIG difference in extra dirt levels in my oil when I had it. Loved the sound at full throttle, liked the extra power at high RPM (both taking away from MPG) Long term I'll take cleaner oil and better MPG's. Others on here will dispute the info but that was my documented experiences on 2 vehicles.

Also a many members reported a drop in mileage due to the REVO's. Much better traction in dry and wet as well as off road, they have not been reported to be a "low rolling resistance" tire. Better grip comes with trade off's but most decided it was worth it for performance and safety. I also notice a difference in mileage between my Cross Terrains and my winter snows (Nokian SUV's). The CT's give about 10-15% better mileage in same driving conditions.

[maddogsvolusia]

I do calculate the MPG and mileage compensating for 1 mile every 10 on the odometer because of the larger tires, so I feel my calculations are good. However, I did forget that the oiled K&N filter can gum up the MAF if it came with too much oil. I have never cleaned that. Thanks for the reminder! I will spray it down with some electrical cleaner and report back.

[hootydog]

My o2 Sequoia gets pretty much 17 in town to 23 highway. It is a 2wd though.
My friends Range Rover is 4wd and she says it gets 10-12..ouch.
good luck Hootydog

[Tundrav8yamaha]

Originally Posted by rmjcvelez

I just traded in my 03 4-runner for a 04 Sequoia-I needed additional towing capacity. The following are my MPG calculations with my new (used-with 18Kmiles) Sequoia:

Without a trailer
City 10.2 MPG
Highway 14.3 MPG (315 miles / 22.1 gallons= 14.25)

Pulling a 4300 lbs. trailer
6.3 MPG over mountains
7.3 MPG on flat straight-away


Something seems way off. I contacted the Toyota Dealership and they say that seems low, but not alarmingly low. I started thinking the electrical braking system on the camper was slightly engaged, but this was checked out by the camper dealership and ruled out.

When buying the Sequoia, I expected my gas costs to go up, however, this is unacceptable for a Toyota.

What should be considered acceptable for my MPG??? Any suggestions on how to conserve gas??? Someone mentioned synthetic oil-any specific brands??

I really miss my 4-Runner!!!

Thanks for all input....

Your figures doesnt seem right

The 2004 Iforce v8 should be getting close to 16/15 city 20/18 hwy

there a few thing's you might want to check number one the maf sensor and clean out the flip door location on top the iforce v8 and clean your injectors could be another area which to look at and or replace your spark plug's and IN line fuel filter located under in the frame.....

Let me know if thats helps

Good luck.

[iceplyr]

Just does not make any sense. I had a '75 F250 camper special with a 390ci motor and a factory Holly double pumper. It got 8mpg loaded or unloded. It could haul a 22 foot boot and have an 11 foot capmer in the bed at the same time and still have plenty of power left. (I wish I still had it) So how does a vehilce as technologly advanced as a new Toyota get 1mpg more?

[dcab03]

My 05 Sequoia only gets 12 MPG in the city and it has been like this for the 12K miles that I have owned it since it was brand new. I knew it would not get good mileage but like someone else said technology should have this thing getting better mileage than 12. I love everthing else about the truck ; well except for the fact the back window stopped working and I have to bring it in to get fixed.

[maddogsvolusia]

I cleaned the MAF sensor, and I have been getting a consistent 15 MPG with mixed driving for several months. I also removed the K&N filter and went back to the traditional style filter to prevent the MAF from getting oil coated.

On highway trips without a head wind, I have come close to 20 MPG with 100% highway between fillups.

The truck is so perfect in every other way, so I'm ok with 15 mpg.

[el_madmaster]

Well. For a while I was averaging 455 miles a tank on the highway. After a while, it dropped down, and my overall range in normal city driving was reduced from bout 350-300. Recently my check engine light went on, and it was the Bank 2, #1 O2 sensor. After getting it replaced, as well as the manifold leak, my MPG has since improved to 468 miles a tank highway and some 370 overall driving - almost better than I have ever seen it.

[ny_transplant]

Hi all. I am new to the board after purchasing a 2005 SR5 4x4 w/37k miles. Been lurking awhile and enjoy the wealth of information found here.

My main issue is the gas mileage. On a full tank, the overhead display has consistently shown less than 290 miles when I fill up. I am getting around 12 mpg based on the display.

Spoke to the dealer about the poor mileage and was told that the oxygenated gas is the cause. But can that cause a drop of 20%+ from an expected 15+ mpg mixed driving down to 12 mpg?

I've read about the oxygen sensors, and trying to figure out what condition has to be met for the check engine light to come on due to O2 sensor failure? Does it have to be a complete failure, and could mine just be fouled and need replacing? How do I approach dealer to get this replaced under warranty or should I just go ahead and replace all four?

Thanks.

[rsterbens@socal.rr.c]

I have 82,000 miles on a '01 Sequoia. All stock including stock size rims and Michelin radials. Never missed a service or oil change. I also have 2 '00 Tundras. The Sequoia mileage sucks. About 10-11 around town, maybe 16 on a all highway trip. The 2 Tundras get about 3mpg better around town. I find it very hard to believe the guys saying they are getting 17 around town. New math??

[06silver]

My 2006 Sequoia Limited 2WD has been getting 15.3 mpg according to the overhead display. (about 75% highway) I may get 19 or so with highway driving. After reading some of the posts here I see that it is not out of line. I am not surprised at the mileage given the size of the truck, I just wish it did better. Poor mileage has been my only complaint with gas in the Houston area reaching $3/gallon.

[Larrison]

Goes about along with my experience.

I'm running a stock 02 Sequoia SR, with stock wheels and etc using SoCal's oxygenated regular gasoline. Nothing fancy anywhere. About 65 K miles on the car.

My mileage runs from about 20 mpg of pure highway driving at 70+ mph to around 13-15 in all city streets (no freeway driving on the tank). Little to no trailer pulling, but the long trips include at least 4 in the car, plus gear.

This is my calculated mileage from my receipts at the pump, not off the display in the car

[epoch]

I have an 01 Sequoia with 99K miles. I trying to get better gas mileage. I've replaced 4 02 sensors, synthetic oil change, all brand new Michelin tires, K&N air filter, gas filter, Lucas fuel injector cleaner, and barely tapping on the gas pedal, yet I'm still getting only 13 mpg in city!!! Help!!!

[indycar89]

I know I piss people off at stop lights, because i ease away gently. It does take effort to get good fuel millage (all other things being equal). I gotta admit through - it sure feels great to bust off the line or mash the gas. On the highway, my MPG drops pretty quickly at anything faster then 70. At 65ish I can get 20 mpg.

[maddogsvolusia]

I did away with the K&N filter and cleaned the Mass Airflow Sensor (MAS), and I improved from 12 mpg to 15 mpg. If I had to quess based on what you wrote, I would say cleaning your MAS would be your next move. You remove it by removing the two screws holding it in the air intake tube and disconnect the electical connector. Then spray it out with your choice of MAS cleaner. I used electrical cleaner from radio shack, but people have said Auto Zone carries a MAS cleaner. I haven't looked for it. The electical cleaner came with a brush on the spray tube that I gently use to clean the resistors.

Originally Posted by epoch

I have an 01 Sequoia with 99K miles. I trying to get better gas mileage. I've replaced 4 02 sensors, synthetic oil change, all brand new Michelin tires, K&N air filter, gas filter, Lucas fuel injector cleaner, and barely tapping on the gas pedal, yet I'm still getting only 13 mpg in city!!! Help!!!