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Old 10-18-2009, 10:41 AM   #1 (permalink)
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Date registered: Oct 2009
Vehicle: 2010 E350 Luxury, P1 Package
Location: South Carolina, USA
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Octanes

E350 gas requires 91 octane. Around here, we have 87, 89 and 93 octance. What happens if use 89 octane instead of 93? Cost used to be 10 cents more per level, but 93 recently went up to 20 cents more than 89.
Thanks.
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Old 10-18-2009, 12:46 PM   #2 (permalink)
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89<91 93>91 See what is = or >91 and answer your question.
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Old 10-18-2009, 12:52 PM   #3 (permalink)
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You will see a loss in power, response & fuel economy. Not worth it in my mind.
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Old 10-18-2009, 01:22 PM   #4 (permalink)
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If you fill up once a week and completely fill your 21 Gal tank, the difference (at $0.20 difference from 89 to 93) wold total $218.40 per YEAR on a ~$50k car. Well worth it IMO.
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Old 10-18-2009, 01:44 PM   #5 (permalink)
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Quote:
Originally Posted by stogie1020 View Post
If you fill up once a week and completely fill your 21 Gal tank, the difference (at $0.20 difference from 89 to 93) wold total $218.40 per YEAR on a ~$50k car. Well worth it IMO.
Agreed. A loss of 1-2 mpg would negate any savings at the pump.
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Old 10-18-2009, 04:33 PM   #6 (permalink)
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Minimum is 91 Octane. MB has no interest in this other than to see that you get the full life and power built into the engine. If you want to cheap out you will pay the consequences. Maybe you should have bought a Chevy
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Old 10-19-2009, 04:39 AM   #7 (permalink)
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Originally Posted by sosh View Post
Minimum is 91 Octane. MB has no interest in this other than to see that you get the full life and power built into the engine. If you want to cheap out you will pay the consequences. Maybe you should have bought a Chevy
Gee, ask a simple question and someone criticizes you. Not a very friendly forum is it?
Regardless, my research so far indicates a very slight loss in power is only negative. Even an M-B spokesperson indicated this in a USA Today article I read.
I plan to use Premium, but was just curious, especially since local stations appear to be raising the price more on premium than on mid-level.
BTW, JoeVal, I know 93>91, etc. This wasn't my question.

Last edited by El Cid : 10-19-2009 at 04:42 AM. Reason: Addition needed
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Old 10-19-2009, 08:42 AM   #8 (permalink)
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El Cid

The responses are comical aren't they? AMCguru is correct, I use High-test, I find my car does run better, and the mileage is a little better, I think the timing is set back when the lower octane is used, and the car runs more sluggish,

Philip
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