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Old 07-23-2017, 12:06 PM   #37
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Originally Posted by 07liftback View Post
I might be an outlier here but tried shell a few times since t-mobile Tuesdays had promotions for $0.25 off each gallon at shell.

I usually fill up at Costco but with shell, The torque felt about the same on my 5 speed yaris but my mpg dropped from 34mpg to 30mpg. I tried filling up at different shell stations with the same result. I can maintain about 34mpg with chevron gas but I just can't figure out why my mpg is much less with shell.

The 76 near my house produced the same results as well.
I've used nothing but Shell station gas since I purchased my car two years ago, and I've been averaging 41 MPG combined over that time period.
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Old 07-23-2017, 12:50 PM   #38
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Quote:
Originally Posted by 07liftback View Post
I usually fill up at Costco but with shell,...my mpg dropped from 34mpg to 30mpg. I tried filling up at different shell stations with the same result. I can maintain about 34mpg with chevron gas but I just can't figure out why my mpg is much less with shell.
The 76 near my house produced the same results as well.
that's what i was getting with Murphy's. sounds like Shell is not mixed well in... where are you from? the "bay area?" is that the Chesapeake Bay? or maybe Monterey Bay? could it be Phang Nga Bay? i know there is users from Thailand. or maybe your in Prison, Guantanamo Bay?
What bay do you live in?
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Old 07-23-2017, 03:44 PM   #39
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Quote:
Originally Posted by 07liftback View Post
I might be an outlier here but tried shell a few times since t-mobile Tuesdays had promotions for $0.25 off each gallon at shell.

I usually fill up at Costco but with shell, The torque felt about the same on my 5 speed yaris but my mpg dropped from 34mpg to 30mpg. I tried filling up at different shell stations with the same result. I can maintain about 34mpg with chevron gas but I just can't figure out why my mpg is much less with shell.

The 76 near my house produced the same results as well.
I've been using Shell since I got Dory (December last year). Before I switched wheels and tires, I was getting 43-45 mpg. After switching wheels and tires, it went down to 40-41 mpg. However, I'm not sure what Shell did, but my last tank dropped to 37 mpg. Tried Chevron (I used to use nothing but Chevron with my first Yaris), mpg was 41. I filled up with Shell again after, and I need to fill up again tomorrow, so I'll see what the calculations come out to. If it's lower than 40 mpg, then I can probably conclude that Shell did something with their formula here in the Bay Area.
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Old 07-23-2017, 03:45 PM   #40
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Quote:
Originally Posted by SirDigby View Post
that's what i was getting with Murphy's. sounds like Shell is not mixed well in... where are you from? the "bay area?" is that the Chesapeake Bay? or maybe Monterey Bay? could it be Phang Nga Bay? i know there is users from Thailand. or maybe your in Prison, Guantanamo Bay?
What bay do you live in?
Bay Area encompasses the counties of the San Francisco Bay here in Northern California.
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Old 07-25-2017, 01:07 PM   #41
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40.76 mpg when I filled up yesterday. First bar disappeared at 91 miles, so it's on track for the regular mpg. It could have just been a bad batch of Shell in the Bay Area.
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Old 07-26-2017, 01:46 PM   #42
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Quote:
Originally Posted by Kaotic Lazagna View Post
Before I switched wheels and tires, I was getting 43-45 mpg. After switching wheels and tires, it went down to 40-41 mpg.
Is this because you went with larger/heavier wheels? 5-10% decrease seems pretty significant. But the aesthetic appeal of nice wheels definitely is worth it. :)
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Old 07-26-2017, 04:04 PM   #43
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Is this because you went with larger/heavier wheels? 5-10% decrease seems pretty significant. But the aesthetic appeal of nice wheels definitely is worth it. :)
I think it has more to do with the fact that I replaced the factory tires...so they were dry, cracking, and had no grip. hahaha. So the new tires are grippier, so more friction, which leads to a drop of mpg. The new wheels and tires are probably only 3 lbs heavier than the 15" steelie and Goodyear combo.
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Old 07-26-2017, 09:52 PM   #44
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Originally Posted by Kaotic Lazagna View Post
I think it has more to do with the fact that I replaced the factory tires...so they were dry, cracking, and had no grip. hahaha. So the new tires are grippier, so more friction, which leads to a drop of mpg. The new wheels and tires are probably only 3 lbs heavier than the 15" steelie and Goodyear combo.
Ah, I gotcha. So moral of the story, if you want to boost your mileage, go with old tires.

There's a Tesoro gas station near me that carries E0 89 octane gas. This thread has got me interested in testing it out.
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Old 07-27-2017, 08:28 AM   #45
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Fuel mileage tread circumference diameter height specification.

On gen 2 Yaris, stock 15" tires roll 3.4% further than stock 14" tires. (per the nominal stock tire sizes, but not necessarily the actual tires) With same speedometer calibration, we think...but haven't confirmed. Tire comparator link on forum gives nominal height/circumference/revs-per-mile/whatever, but the actual tire models vary in height for the same size. Some specs don't give tire height. Worn tires are shorter. Good to run a string or skinny flexible tape measure around inflated tire center to know what you have and compare new vs. old, etc. And/or measure diameter.
I've given numbers for some 14" tires on other threads here.
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Old 07-28-2017, 01:29 PM   #46
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Originally Posted by bradbowl View Post
Ah, I gotcha. So moral of the story, if you want to boost your mileage, go with old tires.

There's a Tesoro gas station near me that carries E0 89 octane gas. This thread has got me interested in testing it out.


I wouldn't waste money on middle grade octane. But give it a shot or two and see how it performs.
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Old 07-28-2017, 01:30 PM   #47
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Just filled up yesterday. 45.65 mpg. Woot. haha.
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Old 07-31-2017, 12:13 AM   #48
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Originally Posted by Kaotic Lazagna View Post
I think it has more to do with the fact that I replaced the factory tires...so they were dry, cracking, and had no grip. hahaha. So the new tires are grippier, so more friction, which leads to a drop of mpg. The new wheels and tires are probably only 3 lbs heavier than the 15" steelie and Goodyear combo.
Car manufacturers are very careful to pick tires that have very low rolling resistance to maximize the printed fuel economy and drive up their overall fleet CAFE numbers. When people buy replacement tires they're usually more concerned with high thread life, good drip in snow and rain, and overall value. If you want maximum mpg's buy tires that are labelled low rolling resistance (LLR) or eco-focused.
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Old 07-31-2017, 12:35 AM   #49
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Originally Posted by B.B._07 View Post
Car manufacturers are very careful to pick tires that have very low rolling resistance to maximize the printed fuel economy and drive up their overall fleet CAFE numbers. When people buy replacement tires they're usually more concerned with high thread life, good drip in snow and rain, and overall value. If you want maximum mpg's buy tires that are labelled low rolling resistance (LLR) or eco-focused.
oh, I knew that. lol

The tires I chose to replace the Eagle LS on the Yaris were the General Tire Altimax RT43. It ranked 2nd best in fuel economy tests in its class according to Tire Rack's tests, and ranked 4th overall in class. It was also the only grand touring all-season tire available in 195/50/16. I didn't want to go with 205/50/16, which was the narrowest that the other tires in its class came in.
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