I think I have a hole in my gas tank!!!

If you put larger diameter tires on, your odometer is no longer an accurate means of measurement for mileage. Every mile it reads now needs to be modified with a multiplier to determine the true amount of miles you have travelled since changing tires.

 

bump

 

Correct me if I'm wrong but.... New tire circumference / old tire circumference x mileage read on odometer trip = actual miles travelled.

 

Spend much time in 4WD? Forget and leave it in?

 

Any ideas what the problem may be?

 

Put it 4x4 just for a sec while towing 67 fastback. But thats it.

 

That is strange... towing and 4X4 usually help gas milage

 

I figured the new tire size and my actual mileage was 173.5. But only brought it from 9.44 to 9.91 mpg.

 

Well any ideas on things I can check would be great.