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#4444360 - 06/28/17 09:36 PM MPG after switched to new Mobil1 FS 0w40
Eugene_Von Offline


Registered: 03/13/15
Posts: 7
Loc: California
anyone feel MPG is better then before? Does FS mean "fuel saving"? Then is a super saving!
I use idemitsu 5w30 before.


Edited by Eugene_Von (06/28/17 09:38 PM)

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#4444383 - 06/28/17 10:08 PM Re: MPG after switched to new Mobil1 FS 0w40 [Re: Eugene_Von]
demarpaint Offline


Registered: 07/03/05
Posts: 29792
Loc: NY
My mpgs are up .3 mpg according to my EVIC. No change to anything other than warmer weather. We've been on summer blend gas for a while now.
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#4444398 - 06/28/17 10:19 PM Re: MPG after switched to new Mobil1 FS 0w40 [Re: Eugene_Von]
OneEyeJack Offline


Registered: 09/14/10
Posts: 7479
Loc: S California
No 2 loads of gasoline from the tank farm are exactly alike and with changing weather, traffic and our driving making a mileage judgement is not much more than an accurate guess.

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#4444406 - 06/28/17 10:26 PM Re: MPG after switched to new Mobil1 FS 0w40 [Re: Eugene_Von]
oil_film_movies Offline


Registered: 06/13/16
Posts: 2569
Loc: MN
Originally Posted By: Eugene_Von
anyone feel MPG is better then before? Does FS mean "fuel saving"? Then is a super saving!
I use idemitsu 5w30 before.

FS means Full SAPS, I think. (Or Full Synthetic maybe.)
The 0w40 is thicker than your SN GF-5 5w30. Thicker oil creates more engine friction viscous drag.
More drag means you have to burn more gas to turn the engine. Physics is cruel man.

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#4444432 - 06/28/17 11:04 PM Re: MPG after switched to new Mobil1 FS 0w40 [Re: Eugene_Von]
69GTX Offline


Registered: 09/23/15
Posts: 3815
Loc: Connecticut
I switched from M1 5w-30 to the M1 0w-40 old version last year. That's even thicker than the new FS stuff. Can't say I've seen any change in MPG since the switch. From winter to summer up north here, air density varies from 10-14%. That should be a change you should notice with other variables fairly constant.
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2001 Lincoln Cont 4.6L DOHC/ 39K mi / QS HM 5w30 / FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs

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#4444451 - 06/28/17 11:44 PM Re: MPG after switched to new Mobil1 FS 0w40 [Re: oil_film_movies]
Eugene_Von Offline


Registered: 03/13/15
Posts: 7
Loc: California
fs 0w40 is not that thick

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#4444707 - 06/29/17 09:22 AM Re: MPG after switched to new Mobil1 FS 0w40 [Re: Eugene_Von]
CT8 Online   content


Registered: 10/09/14
Posts: 11009
Loc: Idaho
3 mpg better and the air pressure on all 4 tires hasn't changed. grin
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