Lost 100 Miles per gas tank

[Peter Kampos]

Hi there,



It seemed to happen over night!!! I severly lost MPG...approx 100 miles per gas tank. The engine light is not on. Any ideas??? I have an 02 4x4 trac with 140,000 miles. 4.1 non-slip differential. My trac seems to idle well, but i've noticed that she is decellerating faster than usual.



This is what i've done to far.



1) Oil change with Mobil 1

2) changed out one caliper

3) new shoes and pads, machined both drums

4) cleaned my K&N air filter

5) 5 treatments of fuel injector cleaner. Anyone know of the best fuel injector cleaner???

6) new spark plugs and wires at 100 K

7) started using 94 octane gasoline as there is less ethanol in it..winter gas sucks!!!:wacko:

8) throttle body cleaner

9) checked and adjusted the psi in the tires

10) both front hubs/bearings are new

11) new sway bar links and tie rods...alignment is perfect

12) driving habbits are the same



Things i have not done.

1) looked into the O2 sensor and coolant temp sensor...but engine light in not on!

2) differential fluid, crankcase fluid...transmission fluid was changed at 100k



I hate it when things don't run perfectly...and I've been attacking this issue with everything I got. I have learned soo much from this forum..and Todd you are the man for starting this.



Any help would be appreciated guys. I hope i am over-looking something easy.



Regards,



Kamps

 

[Sal Adinolfi]

1: Unless your computer is programed for 94 Oct. you should not run it.



2: Running with defroster on (uses the AC) could cause the MPG go down.



3: Over oiling the Filter could cause it to act like it is clogged

 

[Gypsy me]

yep ..recommended fuel should be 87.



change the fuel filter?

 

[Scott Doughtie]

Leaking fittings or cracked fuel lines?

 

[Richard L]

It's probably the colder weather! It increases fuel consumption combinded with slower warm ups and thicker oil, etc especially if you make a lot of short trips, you vehicle never gets fully warmed up to operating temperature.



...Rich

 

[Peter Kampos]

thx guys so far.



I've done the fuel filter. And i understand everything you have said thus far and have considered it into my equation. This issue been going on for about 1.5 months. But I know my trac...5 years and no such problems before. the only reason I started using the 94 octane was to help clean out the injectors.



As well, I am noticing a 'gla-lup' sound every 20 seconds or so while waiting at a stop light...this started happening around the same time my fuel economy went south.



Keep the suggestions coming. Thx.



Kamps.

 

[Woppy V]

gla lup? like when the compressor kicks on n off?



also it is colder outside... do u have a remote start or do u run it for awhile before u get in to drive? because that has a much larger affect on the gas than you'd think! at least thats what i noticed when I started warming her up before heading to work.

 

[Benjamin Feinstein]

If your vehicle is tuned for 87 then use 87 puting 93 in a vehicle tuned for 87 can actually lead to build up not remove it.



As for the lower millage it is probably due to a different type of winter blend. I know here they have started adding more and more elthanol into the fuel in winter months and I do notince a drop in mpg.

 

[Peter Kampos]

glu-lup sound...its not from the compressor i don't think. I only use defrost when needed and shut it off. I am curious to know when does the compressor kick in? the 94 octane was only used the past three tanks! problem has been consistent for awhile now. And I think its due to a warped rotor...causing braking drag. But I'll see what happens in the next couple of weeks.



thx.