[cfguy2000]

I just replaced my 200,000 mile worn out front wheel bearings in my 1997 Corolla. 0 difference in mileage. I really doubt there will be an mpg difference among different grease types if changing the bearings did nothing other than fix that terrible noise my car would make around corners.

In fact, the guy at the performance shop where I had my bearings pressed on said that they don't even add any extra grease from what comes from the factory bearing. I added some store brand high-temperature bearing grease anyways.