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Mechanical Maintenance (Oil, Fluids, Break-In, Servicing) Everything related to the mechanical maintenance of the FR-S and BRZ |
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03-22-2015, 12:10 PM | #1 |
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Changed Diff/MT Trans Fluid to Motul 300 and super low MPG
Just wondering if anyone else had effects such as this... I changed out both my MT fluid and differential to Motul 300, and went from 29 MPG to 23... Is this just due to a break in period of the new oil? Or just characteristic of this particular oil? Thanks!
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03-22-2015, 12:14 PM | #2 |
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I saw no change at all in mine. 30 MPG solid.
It's not the oil causing a 20% reduction in your gas mileage |
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03-22-2015, 01:28 PM | #3 |
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Tire pressure, driving habits, bad fuel, different weather can all change your MPG, but a bit of oil certainly wont! :P
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03-22-2015, 02:08 PM | #4 |
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Just curious, I just checked tire pressures, I did bump up to 8 inch wide wheels and 255-40 tires... But doubt that's going to do that either... And I actually have been driving more conservatively
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03-22-2015, 03:36 PM | #5 | |
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If you're running something else, you've found your problem. The Primacy HPs are low rolling resistance tires. 'Usually' going to a thinner MTF fluid will increase fuel economy. |
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03-22-2015, 05:38 PM | #6 |
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Heavier wheel and tire combo can definitely affect MPG...and a non LRR tire too.
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03-22-2015, 07:44 PM | #7 | |
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That's like someone saying they switched from Exxon to Shell fuel and noticed a decrease in the fuel mileage...then later posting "Oh yeah I also installed a turbocharger system with higher capacity/flow injectors at the same time...." LOL
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03-22-2015, 09:44 PM | #8 |
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Except looking back, I did my wheels and tires first, and hadn't noticed a difference but had been driving highway only... then did the fluids change and have been driving local+highway... only noticing it greatly now... I am currently on 17x8 Enkei RP03 wrapped in 245**-40-17 Dunlop ZIIs... not LRR, but lighter combo than oem setup.
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03-22-2015, 09:48 PM | #9 | |
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03-23-2015, 12:00 PM | #10 |
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It's the tires. Going from the Michelin Primacys to Bridgestone RE11As brought me down to about 23-24 as well.
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03-23-2015, 10:28 PM | #11 | |
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Had a '13 FR-S Asphalt 6spd manual (bought new 5/25/12, sold 6/10/20) but needed to let her go... she will be missed.
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03-23-2015, 11:17 PM | #12 |
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You added unsprung weight and increased your rolling resistance.
Result is too be expected. As least you can sleep well knowing nothing is wrong.
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03-24-2015, 12:47 AM | #13 |
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I noticed there are difference between different brand of gas. I am getting much better fuel economy with Shell V powaaaah.
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03-27-2015, 08:42 AM | #14 |
Tires and wheels over stock will make a HUGE difference. Therein lies your issue.
-mike |
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