Has anyone actually logged a gas milage increase between different oils

[AcuraSLX]

I use Red Line oil and I have found a bigger difference between winter and summer gas here in CA than in oil. My particular engine is a low friction 3.5 L Isuzu V6. In a high friction 454 ci GM V8 you might see a difference.
There seems to be less oil burning with a low NOACK volatility product such as RL. These Isuzu engines from certain years seem to have oil burning issies with dino oil.
I have seen a change in fuel consumption with 20-50 over 10-30 in a Nissan 2.4 L I4.

 

[bruce381]

Bruce,

Are you multiplying the tank capacity or actual gallons used? If your multiply by tank capacity those arent actual numbers

Didn't think about it just figgered 20 used I put down tank but ment used.
bruce

 

[Bryanccfshr]

TRDUSA,
I think bruce was using hypothetical figures to demonstrate what 3% improvement adds up to.
I think 3% is being extremly charitable to the amount that viscosity differnces alone can make.

 

[Geno]

If Synthetic would increase milage by 1 or 2 MPG all car makers would recommend (require) its use> if they could raise the fleet average that much with just oil they sure would use it.

 

[JavaMan]

I've pretty much gave up on trying to really peg mileage gains or losses. I figure there's too many variables to determine wheather I'm getting a mile more or less. I just check occasionally to see if I'm in the ball park of what I should be getting.

 

[stang5]

on my 91 pathfinder w/ 147K miles (3.0 V6) There's no difference at all in MPG between chevron 10w 30 that sheared down to a 20 weight( according to uoa) versus GC 0w 30..