Who needs a hybrid!?

[ZDan]

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

[l0aded]

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

[jflogerzi]

Originally Posted by ntr0py

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!

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

[fistpoint]

Originally Posted by @Art_Mighty

...downhill

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

[ntr0py]

Originally Posted by jflogerzi

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

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

[ntr0py]

Originally Posted by fistpoint

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

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.

[smbrm]

Originally Posted by WHITE

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. 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.

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!

[WHITE]

Originally Posted by smbrm

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.

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.

[jflogerzi]

Originally Posted by ntr0py

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

haha and it continue to drop.

[smbrm]

Originally Posted by WHITE

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.

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

[SloS14]

Originally Posted by WHITE

Soooooo unless theyre all wrong then my computer compensated for the change in size? Idk.

psychic ECU?

[WHITE]

Originally Posted by SloS14

psychic ECU?

Who knows, maybe they got super powers? My cars psychic, that other guys brz tried being the human torch......JUST THINK WHAT OUR CARS CAN ACCOMPLISH IF USED FOR GOOD.

[chrisl]

Originally Posted by smbrm

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

That depends on a lot of factors - you can't just plop down a single number like this. If conditions are right, you can do a lot better than 7.8 meters, but in bad conditions, it could be significantly worse too. Also, positional accuracy doesn't tell you much about the accuracy of a GPS speedometer - most of the errors in GPS are not randomly distributed, so GPS is much better at determining the difference between two positions than it is at determining absolute position (which is the reason why dGPS and WAAS work as well as they do). This means that GPS speed is pretty darn accurate, all things considered, and I would tend to trust it more than just about any other method (various reports I can find seem to indicate around 0.2-0.5mph speed error for consumer-level GPS).

[smbrm]

Originally Posted by chrisl

That depends on a lot of factors - you can't just plop down a single number like this. If conditions are right, you can do a lot better than 7.8 meters, but in bad conditions, it could be significantly worse too. Also, positional accuracy doesn't tell you much about the accuracy of a GPS speedometer - most of the errors in GPS are not randomly distributed, so GPS is much better at determining the difference between two positions than it is at determining absolute position (which is the reason why dGPS and WAAS work as well as they do). This means that GPS speed is pretty darn accurate, all things considered, and I would tend to trust it more than just about any other method (various reports I can find seem to indicate around 0.2-0.5mph speed error for consumer-level GPS).

I didn't just plop down a single number! I just quoted one of the numbers from the standard: http://www.gps.gov/technical/ps/2008...e-standard.pdf

It appears you have convinced yourself, so by all means, carry on. No further need for debate.