Who needs a hybrid!?
 

Couldn't believe it this morning, but this is my 16 mile commute on the I-5 North in SoCal traffic from a Costco Gas to my work parking lot (in traffic)! I wasn't pushing it too hard but wasn't totally doing FE driving.

FR-S M/T with about 4500 miles on it and a full tank of gas! :w00t:

That is great mileage! However, I must say that the "trip computer" at least in my experience is very generous in its calculations. When I do the math manually at fill-up, I am often several miles per gallon LESS than what the computer says.

The best mine has ever displayed is 32 MPG (I have a manual, and drive mostly in town with stop and go). My typical average at fill-up is 24 to 26.

That's true. I keep track of my mileage at the pump and reset my average mpg meter every time. It usually reads about 2 mpg better than what the pump says. This was the first time I've ever seen the meter hit 40 though.

I drove 365 miles a few weekends ago and averaged around 34.5 MPG. BRZ has over 10000 miles and is a manual. I was quite impressed. You can also check my Fuelly in my sig :)

According to the trip computer I'm rocking 23.0mpg. I think around 1,250 miles on the odo and I haven't reset it. And I'm generally easy on the skinny pedal. I do have about 58790825 stop signs in my daily 4 mile round trip commute so that explains it.

Its really impressive how well this car does on gas when your not driving like an a-hole. My current best was during a return trip from Williamsburg VA to wilkes-barre PA. i did the entire 334 miles trip on less then a tank of gas getting my highest avg. of 44mpg, this was even with 2 hours of stop and go traffic, going 65-75 mph when possible, and having 265/40 18's on the back and 255/40 18's up front on 18x9.5 rpf1's. 6spd manual trans also.

I was speechless.

Edit:
i lied, just found the picture i took of my avg. during the trip,

*yawn*

http://www.fueleconomy.gov/feg/noframes/18.shtml

I get about 32-33 MPG highway and 23 city. I came from a TSX before this so its not much of a difference. However, I love that I can get this mileage in a sports car.

A great way to track true mileage is with Fuelly . Also a benefit is that you can add it to your signature.
I have been very impressed by how well this engine is able to manage fuel. Stock tune or not this engine really likes to use every last drop...

I've been driving hard for the past few tanks.. Still seeing 29.3 average!!

How accurate is the MPG display? I think mine is way off to be honest with the mid 30's. Id say im getting maybe 26-28 (mostly highway with mild traffic miles)

Its "relatively" accurate in my experience. I track my mileage and fuel fillups using the Fuelly app + resetting the trip/average MPG at each fillup.

Car computer has me between 27.5 - 31 mpg with about 50/50 highway/city driving. Fuelly app has me at 27.9.

How flat are the places you guys drive?!?

I have 21.5mpg mixed on my FR-S and it's kept below 3k RPM since it has 430 miles.
I get 42mpg mixed on my 2012 Prius.
I had a Scion xD that got 19mpg mixed
My 06 Corolla gets 24mpg mixed.

I do live in a hilly place with 8-12% grades for over a mile.

Cant get mine past 30..

I have a mostly light downhill drive from SLC to my place about once a month -- 45 mins all freeway. Got the trip display to show over 40mpg when reset after getting on the freeway. 6AT here. It was awesome.

Also just took her from SLC -> Vegas, San Luis Obispo, Carmel, Monterey, Tahoe, back to SLC and averaged 33.5 according to trip - that's including some spirited driving on the PCH. Awesome stuff!

Proof: http://imgur.com/881bmC6

The freeway is pretty flat but my home is about 2 miles off the freeway and it's all up hill and down hill from there. My average for the life of my car (about 4500 miles) is just over 29 mpg. I keep track of it using the Gas Cubby iOS app (didn't know about Fuelly). The 39 mpg I got above was all pretty much flat.

I've gotten 42 on a 10 mile trip before. However, I have a hard time maintaining above 29 on the computer. Once you get on the gas that average plummets :(

You guys drive like grandmas.

If I want to drive like a Jackass, I take my other car. The BRZ does just fine on fuel and with so little relative power stomping on the go pedal every so often only hurts a little.

I like to keep the revs relatively high while not necessarily driving like a jackass so I don't always have to downshift to accelerate. It makes me laugh to find out that the meter actually reads high. I cleared mine today at about 1200 miles, with a 24.x mpg average. In the short trip thereafter, I didn't come remotely close to 20 mpg :bellyroll:

-Jackass

Mine gets 127 mpg :)

I wish I could see those kind of numbers. Mine gets about 20-21 mixed driving.

So how did you get the odometer/computer to compensate for the larger diameter rear tire?

I didnt, i assumed it would screw up the computers read out but the speedo has been dead nuts with every gps/speed sign/iphone app/other car woth me. Soooooo unless theyre all wrong then my computer compensated for the change in size? Idk.

Did you verify the speedo with the oem wheels before the swap?

Most speedometers read 2%-5% faster than what you're actually going (my truck is 8%) which would also explain the optimistic mpg readings, with a larger tire spinning at the same rpm as the old small tire the overall vehicle velocity will be faster with the larger diameter tire, basically covering the built in compensation with the speedo.

The computer has no fucking idea what diameter your wheels are, it's just looking at the final drive speed is coming out of the transmission. Most wheel swaps aren't big enough to matter especially given most areas plus or minus 5 mph isn't a big deal.

Also larger diameter wheels are basically adding gearing which lowers rpm and improves fuel economy. Not accounting for the weight gain.

The 46.5mpg was just a one time thing with my 265's and i have not come close to getting that again, i tried hard to get the highest mpg i could on that trip. On my normal commute to and from work all highway i get 27mpg +/- 0.5 with my 265's. with my stock wheels and tires i was averaging 31mpg on the same commute.


I have no clue about the whole speedo crap, i didnt even know the speed sensor was in the diff(never cared to looked for it to be honest) all i know is yime and time again ive checked my speedo versus other speed read outs and so far the most its been off was a "your speed is" sign saying i was 1mph slower then my speedo. :iono: idk im not going to try and figure it out, im just gonna continue to drive, i dont care about mpg at all i fill up when i need to fill up and thats it.

...downhill :D

I don't. I get 26 mpg in my 560hp supercharged Corvette on the freeway!

http://www.fuelly.com/car/scion/fr-s

278 FR-S's, 5673 fill-ups, 1,472,992 miles tracked
Overall Average = 27.5mpg
Minimum vehicle average = 21mpg
Maximum vehicle average = 35mpg

Damn that's pretty high. My average 50/50 commute I get about 28 not driving conservatively. Driving mad gives me 26.5 still =)

Just wait, it will drop. I used to see that when I DD to work with my car. Get gas, and hop on the freeway .5 miles from the gas-station. 20 miles later I had that mileage. But drive on the streets for a few miles and watch the MPG drop :)

No, just let off the gas and put it in neutral...it peaks at 127 until you hit the pedal again.

I went out to lunch and pushed it harder. It dropped 10 MPG in under 20 minutes :thumbdown: Now I'm sitting at my normal 31.5 MPG average (according to gauge which probably means 29.5 MPG).

FYI, you actually get better mileage when you keep it in gear and let off the gas going downhill. It shuts off the injectors so no fuel goes in the engine. If you put it in neutral, it has to idle the engine to keep it from stalling.

Tire size and speedometer calibration are also important to speeding violations, especially, speed on green/stop light cameras. Usually they have a small grace range, however with bigger tires it is useful to know the impact so you can "remember" to compensate! Remembering being the key word!

For the rear tire size quoted 60 mph on standard tires = 64.212 mph on the 265/40-18. That is going to be noticeable somehow!

I get what your saying and i understand what it should be, but clearly nobody is reading what im saying......so ill try again........

when compared to the "your speed is" signs in construction zones, and gps, and other vehicles around me, Everytim(except the one time i was 1mph off) my speedo has been reading true at no matter what mph.

haha and it continue to drop. :slap:

I appreciate what you are saying.

So that suggests that(all other things being equal) "your" speedometer was off by almost that amount before you changed tires if its that close after you change.

For reference
http://www.paspeedo.com/calculator.htm

GPS is only accurate to 7.8 metres at 95% confidence.

You seem to have it rationalized. Hopefully the speed devices you are being judged by always work in your favour.
Good luck.

One thing that is for sure is the fuel efficiency of the FRS has a wide variation span.

The Fuelly range of FE quoted earlier is the observed range of "average" FE. Max and worst FE have been observed beyond these numbers. While it doesn't impact the numbers, the interpretation of what is city driving by each individual has an impact on how you can interpret and compare the Fuelly numbers to what you might be expecting.

Cheers

psychic ECU?