Better mileage after long drive

[Ddreder]

What I wonder is how is your mileage so low? On my 23 mile commute I would average 30-32mpg with the stock tires. With my new 235/50r17's though.. I think I have lost a bit because of how tall and heavy they are. But I need to do some scientific testing with it as I gave up on tracking my gas mileage after doing it for months lol

[86SPEED]

on E82 i get 15ish MPG during my normal commute, i can bump it to 17 if i really try. My straight highway mpg on E82-E83, (we hit E85 hardly ever here) is 25-28 depending on the route. one way is a little more up hill. On pump i can get 32-36 highway, and low 30's city.. BUT the extra 115hp make it all worth it

-Thomas

[strat61caster]

Originally Posted by Ddreder

What I wonder is how is your mileage so low? On my 23 mile commute I would average 30-32mpg with the stock tires. With my new 235/50r17's though.. I think I have lost a bit because of how tall and heavy they are. But I need to do some scientific testing with it as I gave up on tracking my gas mileage after doing it for months lol

Depends entirely on the commute, stop and go tanks the mileage in this thing, I gave up my long commute and my mileage has nose dived since I'm on city streets instead of smooth flowing freeways (even though they were slow) so my mileage looks terrible but I went from filling up 4x a month to 2x a month roughly speaking.

http://www.fuelly.com/car/scion/fr-s...7974/fuelchart

I used to get high 20's and low 30's really consistently, now I'm low 20's. Although sticky tires and a heavier right foot surely have played a part.

[jeepmor]

Just used the onboard mileage device. After a tank, it's back to normal at about 26-27 on my commute. Settled back in after a tank of commuting.

Just wondering if it might stick. I know all about that city versus hwy mileage, no need to explain that in detail. But it did stick around for the next tank a bit higher than normal. I'd suspect it had something to do with the all petrol super I put it, couldn't have hurt things, and all petrol does get better mileage than ethanol'd dilutions.

[Chad11491]

My commute is 80% highway 60 miles each way and I average (odometer/gallons put in) 31-33 mpg going around 75 most of the way. I'm more than thrilled about the mpg, considering I regularly get on it as well.

[Tcoat]

Originally Posted by jeepmor

Just used the onboard mileage device. After a tank, it's back to normal at about 26-27 on my commute. Settled back in after a tank of commuting.

Just wondering if it might stick. I know all about that city versus hwy mileage, no need to explain that in detail. But it did stick around for the next tank a bit higher than normal. I'd suspect it had something to do with the all petrol super I put it, couldn't have hurt things, and all petrol does get better mileage than ethanol'd dilutions.

Nah, it just took a while for your average to come down after the trip. I mix my gas up like some people mix their drinks and use different grades and ethanol or not just about every tank and my average mileage has not budged one single decimal point since I have had the car. I drive exactly the same routes, in the same manner, at the same times every single day so there is no variation in my usage and the different gas has had zero effect.

[jeepmor]

I do record the data on a mileage log. It's not with me now to review. However, I also reset the mileage estimator each fillup and it's usually pretty close, at least within an mpg typically.

Thanks for the input, I'll have to do the real math from my numbers to find out. I suspect I still had a higher blend of real petrol in there that took 2 more tanks to go through as I filled it up twice when there was only half a tank or so in it because I was heading over the mountain pass with fairly long distances between the next station.

On the way home I topped it off, about 5-6 gallons of typical ethanol blend, then trucked all the way home, 331 miles IIRC, until the thing was on fumes. I pulled into the station and it took 11.46 gallons to fill the tank once I was 2-3 miles from home. That's the furthest I've stretched it on the yellow light, doubt I'll stretch that far again. Car may be considered light at 2750lbs, but that's still a lot to push.