NEED HELP!!!! My Tacos Drinking gas like crazy

dont top off the gas, just stop when it clicks so you get an accurate calculation each time. i'm getting 17 average mix driving

 

Gents my fuel estimation process has went like so tank 1 from dealer drove till light hit odo said 260 tank 2 filled max drove to half tank marker odo said 127.8 filled up at half tank (87 oct) took that gallonage and drove to half tank again odo said 127.6 drive the rest of the tank down to light odo said 234.6 repeat repeat repeat so on and so on.

I then filled max 89 oct this time)got some Seafoam and put it in my Vaccum line and fuel milage was realllly bad on that tank I chualked it up to the revving and blowing whatever crud that was there out. A couole of tanks later and same methods said above used same thing 89 127-130 at half 264 at light. That was the best 2 tanks yet then it dropped to 128-130 at the half and 220-230 at the light using 89 from various gas stations.

So I thought well I screwed up my plugs w Seafoam, changed the plugs while I was doin that I took care of the other under the hood processes I mentioned. Other than a lil oil and some carbon build up old plugs looked ok. I have ran 3 more tanks of gas using the same method w new plugs and other prev. Maint and Im still getting the same milage as before

 

I removed my secondary air filter a couple day ago and got a lil better throttle response, it was pretty dirty, I have an 05 maybe it will help you out

 

No I havnt changed Diff Fluids yet its on the list of things to do next weekend

BUT Low and Behold I get in her tonight to drive home from work and what happens.... Drumroll..... The Maint reqd light pops on when I start it along w the Light and airbag Icons .. And Maint Reqd stayed burning LOUD AND PROUD .. I reckon shes going to the dealership to get tickled under the hood! Its been 2 wks since the plug and air filter change so who knows what it could be maybe something was on its way out and finally bit the dust completely

 

i have 285/75 tires and a steel plate rear bumper. i have never seen past 17mpg. and that was all highway. i average 14.5mpg in the city. does that lucas fuel injector cleaner actually work or help at all?

 

the maint reqd light is just a reminder for oil change, which should be reset when you change oil, it will start flashing at 4500mi and stay on when you hit 5000mi

as far as mpg's my 06 DBCSB averages about 16mpg's hiway or city, doesn't seem to change whether I have the stock tires or my 305's

as far as hiway, when I get on I'm usually running 70-75mph cause I just want to get where I'm going

 

Just had an oil change in Jan when I bought it from dealer so Im not sure thats it, Im not saying your wrong but it hasnt had 3k put on it since I bought it. But who knows Im going to be swinging by dealwr tomorrow to check code and schedulig appt for Tues

 

stealer might not have reset the lite

 

Save the hassle. The ONLY thing that light means is that it's time for an oil change.

It simply didn't get reset at the last service.

 

For whatever its worth, I lost gas milage when I changed my air filter and box over to a K&N CAI in my tundra. My taco I just removed the secondary and put a afe pro dry

 

Bigger heavier tires kill fuel economy.

Every now and again I put some Lucas oil in the tank to keep the injectors running smooth.

Steve

 

Wouldn't a bad O2 sensor make the check engine light come on? I know it did on my old 1st gen.

 

WHAT IS IT W THE TIRE TALK THEY ARE THE FACTORY TIRES ACCORDING TO THE DEALER. If not then what is the factory size tire for a double cab 4WD TRD

This is a Certified Used Veh. so you would have thought they would have reset the light who knows Reguardless its going to the dealer on tues .... I'll let you know what they say The O2 Sensor is what Im leaning towards myself through this whole mess .. or a minor exhaust leak

 

Not sure never experienced the problem myself. Had a friend that had one go out though and it killed his mpg's and I don't think the CEL came on.

 

Make sure all the ducting to the MAF is tight so there is no false air and look for any vacuum hoses that are split, worn or off completely especially around the fuel pressure regulator. Rubber hoses and wiring can get caught and burn under the EGR valve, too. Engines don't like vacuum leaks or electrical shorts.

Make sure your tires are up on pressure (I know you have). I personally would set them around 34-5 psi and see how that works out.

And one other thing (I know ths is stupid but I've done it) make sure you're not driving around in 4x4 Hi!


Steve

 

I cant really complain ,I had an 05 F-150 that I was only getting 10-12 mpg and the Tacoma is getting 18 to 19.50 ..Can't quiet get 20 yet but I think it will when the weather warms. This truck and our 07 Corolla are the only two vehicles that have ever gave the gas milage that they were suppose to.according to the sticker..I'm happy with both of them..

 

You're right. Brain fart.

OP, listen to everything I said, except the part about running it down until the light comes on. Just keep track of miles and then at top off, divide miles by gallons added.

The whole 230-260 on a tank thing is meaningless, because he isn't defining a "tank." Obviously, he isn't running it from full until it dies. I just used 17 for my calculations, based on the assumption that he was running it until the light came on and then filling up very shortly after.

 

I'm getting 18mpg fuken lead foot

 

What would be the best tire pressure to run with 285's... My average is only 15 as well

 

so the number of miles to a tank doesn't matter? right now I'm at 240, on E, and I have an 08 prerunner with a 6" lift on 35" mud terrain tires, stock gears, no engine mods at all to improve gas, and stock exhaust, which I'm getting ready to switch to flowmaster, so what would be the best mods for a truck like mine? some of you suggest mods for a certain number of miles, etc I'm at 36k

is 240 bad for a whole tank? when I fill up I'll use the same pump and divide by the number of gallons I put in and see what it is, but I know it'll be 16ish gallons and probably end up being 15ish, any ideas? or is that about the best it's going to get for the size tires I have? thanks!

ok so its actually 18 gallons instead of 16 putting me at 13.5 mpg lol that's not so good, but like I said it probably won't get much better since I run 35s right?