Originally Posted By: 2010_FX4
Originally Posted By: davison0976
Luckily I maintain very detailed records on mpg, get gas at the same Exxon station, even the same pump, or Shell, and always 93 octane for the VQ37VHR (had just turned 20,000 miles).
So are you suggesting the oil filter on your vehicle is playing a major role in your MPG?
Hard to conclude anything at this point. I am considering 4 hypothesies, or any combination of the 4:
1. Winter gas. More drag from other (differential, TC and tranny) fluids due to colder weather.
2. Amsoil is a lubricant superior to PP, and possibly M1.
3. Oil filter.
4. Engine problem.
I am completely brands agnostic and will be looking to accumulate factual data before I'll have a good idea of what the reason may be.
Observations lead to hypothesis, which leads to experimentation aimed at either proving or disproving a theory.