Does Mid Grade Gas effect performance? - Page 2 - Mercedes-Benz Forum

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post #11 of 17 (permalink) Old 01-28-2012, 09:37 AM
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Just as a sample how much efficiency high compression brings.
Gasoline engines with compression 8-11 have 30-35% of efficiency.
Diesels with compression >20 are having 40-51%
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post #12 of 17 (permalink) Old 01-28-2012, 10:36 AM
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Bottom line -on regular or mid you have to drive slower and that where the savings are coming from.
That is simply not true.
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post #13 of 17 (permalink) Old 01-28-2012, 10:52 AM
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That is simply not true.
PROVE IT?
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post #14 of 17 (permalink) Old 01-28-2012, 11:07 AM
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300E91,

I just read your post and that is pretty convincing. Not only all of your cited experts, but the 60 tank study you did yourself.

Although I choose to use premium fuel I have stated several times, ignoring octane rating for the moment, that it's best to stick with top tier fuels. The last time I checked the list, the only one here is Shell. I used to use Chevron/Texaco but they pulled out and Shell came in so that's why I made the change.

But as an aside, I continue to add Techron every 3000 miles as a preventative.

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post #15 of 17 (permalink) Old 01-28-2012, 11:25 AM
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Musikmann,

Thanks for taking the time to read my earlier posting. I believe decisions should be made on accurate information, not anecdote and mythology.

Your decision to use "top tier" suppliers is completely consistent with the advice of the experts I cited. Since there are only a few refineries, the same fuel goes to many different outlets. Some stations may end up contaminating the fuel with leaky or poor condition tanks and such. Off-brand stations often look suspect in that regard to my eye while refinery-owned and franchised stations are more likely to have higher quality control. Like you, I'm a fan of Techron also.

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post #16 of 17 (permalink) Old 01-28-2012, 11:40 AM
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Top tier

300E91,

You're welcome, very worth the time spent. BTW I just noticed Exxon finally made the grade (no Mobils here) so now at least I have a local alternative.

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post #17 of 17 (permalink) Old 01-28-2012, 12:05 PM
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[QUOTE= Interestingly, a higher octane fuel has a lower energy content than a lower octane rated fuel. [/QUOTE]

Actually, higher octane fuel has a GREATER energy content because it uses larger molecules on average than does lower octane gas. As a result, it burns more slowly than regular gas. In high compression engines, regular gas can light off too soon, before the spark, causing pinging.
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