I currently commute 45 miles each way on freeways or well-maintained state highways, and there are lots of long downhill sections. '13 BRZ auto, everything stock. I'm averaging 36.4mpg in those conditions over the last 6 months.

Just for contrast, I absolutely do drive it like a Prius while commuting. (In fact, I sometimes get better mileage than my wife's Prius in her much-less-helpful driving conditions). One of the reasons I bought a BRZ is that it's fun to drive even with MPG in mind. I save the "spirited driving" for the track and canyon driving. FWIW, acceleration rates for me are dictated by traffic flow, not by my preference to be fast or slow.

Over 70k miles in 5+ years and a variety of commuting conditions, I've averaged 30.3mpg.

Fully modified with 17" wheels and I also get exactly 21.5 in LA. Don't worry.

I drive city 95% of the time with stop and go traffic. average mpg came out to be between 26-28 and that's me being drive somewhat toughly.

LOL I said I figured that back when this started. I am just poking back really. These MPG threads are always a hoot. It should break out into the AT vs MT brawl any time now.

This ^
It is completely impossible if you live in an urban center to drive it ball out all of the time. Well not unless you don't mind tickets and accidents.

I don't have a fancy fuelly thing set up to record it like i have seen on others profiles...

I have a 75 mile round trip commute plus I have taken two 1,000+ mile road trips. That being said, I try to drive it gingerly when I can but those off-ramps mhm..

I have 2 numbers
I have noticed on Subaru's 0w20 oil and Schaeffer's 0w20 Oil I hit around
30

However, on Schaeffer's 5w30 I get around 32. I hit 37.5 on my 1400 mile road trip to yellowstone and the tetons in WY

Has anyone else noticed a difference in oil weights with MPG?

You had to go there.....

There are likely other factors that explain the gas mileage improvement. 5w30 should yield lower gas mileage than 0w20... a big factor in so many cars using 0w20 from the factory now is to improve the gas mileage ratings for any given model of car.

You can’t calculate gas mileage based on distance travelled without knowing how many gallons of gas were consumed. Just because you stopped to fill the tank doesn’t mean that you used all of the gas in the tank.

OH shit we just hit the Trifecta, Gas mileage, AT vs MT, What is the best oil.

This thread will never die now!

Live on young one!

Theoretically yes, thicker oil is harder to push therefore it should be better to have thinner oil, (strictly in terms of simplified physics and resulting mpg) currently I have 30.7 on my dash display been 1.5k miles since last oil change and 7.5k since it had 5w30 in the car

Need to do more testing though
Hard to have consistency between oil changes though, plus I'm getting it ready for track and autocross this year so i won't be able to get "accurate" data for a little while

You forgot the most important element...

http://i0.kym-cdn.com/entries/icons/...17/994/cac.jpg

Oh we still need to cover lightweight pulleys, sub $2,000 turbos, big wings and the best coil overs for a 3" drop without impacting handling or ride.