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Old 07-01-2016, 08:19 PM   #1 (permalink)
Mirage 5MT driver
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Toyota Prius 10% gain from switching to high mileage oil

I found a fellow uber driver that claims he gained 10% fuel economy from switching to high mileage synthetic oil from Firestone. I think he said he went from 42mpg to 48mpg. I told him it's more likely his driving that changed the mpg rather than the oil. He stands behind the oil changed the car, I told him I would post on here with mpg experts, I tried to explain there's way too many variables on daily driving to measure gains accurately, not sure if anyone has gained much mpg from a oil upgrade? 10%?

1999 Civic EX coupe Autotragic -MPG project best mpg 54.2 w/masking tape mods otherwise stock. -SOLD

2014 Mitsubishi Mirage ES 5MT. 15k miles 44.2 mpg avg overall in my mountain, northern PA

2010 Cobalt sedan XFE -project uber/mpg taxi.
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Old 07-01-2016, 10:30 PM   #2 (permalink)
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An increase is likely if changing from conventional to synthetic. But not 10%

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Old 07-01-2016, 11:03 PM   #3 (permalink)
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42 to 48 isn't 10% anyway. Two fails.

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Old 07-02-2016, 02:05 PM   #4 (permalink)
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November, 2014, I changed motor oil in my Mustang. I'd been running Motorcraft synthetic blend 5W-30. I switched to Mobil 1 full synthetic 0W-30. Fuel economy gain was about 1.6% or .5 MPG.
Mobil 1 website states that switching to their synthetic 0W-** synthetic oil can give increases of 0.2% to 2.0% in fuel economy. Since I drive shorter trips in my commuting, my fuel economy increase was closer to 2%.
A 10% increase in fuel economy would require some serious mechanical and/or aerodynamic modifications and/or significant adjustments to the "nut behind the steering wheel". Synthetic oil won't make that much difference.
Fuel economy is nice, but sometimes I just gotta put the spurs to my pony!

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Just 'cuz you can't do it, don't mean it can't be done...
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The presence of traffic is the single most complicating factor of hypermiling. I know what I'm going to do, it's contending with whatever the hell all these other people are going to do that makes things hard.
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Old 07-02-2016, 04:50 PM   #5 (permalink)
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Ooh ooh! I know! He changed from 60w to 0w!
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Old 07-03-2016, 03:30 AM   #6 (permalink)
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Is it perhaps getting warmer in PA, right around the time the oil was changed? Could be a dozen reasons for getting better MPG, including errors in measurement and calculation, but almost certainly not from the oil change alone.

On a related note; I got 3 MPG better on the freeway than normal while pulling a jet ski. I also traveled about 10 MPH slower and drafted a semi, with my wife tailgating since my trailer lights weren't working.
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Give me absolute safety, or give me death!
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Old 07-03-2016, 08:18 PM   #7 (permalink)
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didn't happen.
placebo effect. He 'wanted it' so he got it.

MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game."

First: ScangaugeII

Second: Grille Block

Third: Full underbelly pan

Fourth: rear skirts and 30.4mpg on trip!
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