Gas Companies and MPG - FMVperformance.com : The site for all your Ford Mazda and Volvo needs
 
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post #1 of 4 (permalink) Old 11-13-2005, 11:55 AM Thread Starter
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Gas Companies and MPG

Have heard from different sources that by filling up at cheapo gas stations your MPG will suffer.* Lets say we are using an 87 oct. each time and everything else is equal, would the fact of not filling up at a top brand gas company like Shell, make your MPG suffer?* Does ethanol play a role?
Heard it about Arco, which I thought has good gas.
Have not been able to confirm these things.* :huh Can anyone can second these statements?
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post #2 of 4 (permalink) Old 11-13-2005, 01:59 PM
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Re: Gas Companies and MPG

These assertions are, by and large, entirely false. Gas is gas. The difference between most brand names and no-brands is that brand names add differing degrees of their proprietary detergents into the fuel and advertise the difference as being better for your engine's longevity, performance, etc. Government regulations demand that all gasoline has some minimum level of detergents in it so it's not like you're missing out with no names. Additionally, those no-name stations don't actually drill for and refine oil like Shell, BP, Chevron, etc... Where do you figure they're getting their gasoline from?

Most new engines can handle gasohol without issue, but whether they need it or not is another question. Ethanol gives the gas a higher octane rating and therefore reduces knock. Great idea for your grandpa's carbeurated clunker, assuming it can handle the gasohol at all, but not so much your 3. The supposed benefit is that it burns more slowly and completely, thus producing less emissions. It's not cheap (money or energy wise) to make, though, so the benefits of burning it are probably largely mitigated by making it, but I don't know about that.

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post #3 of 4 (permalink) Old 11-13-2005, 02:54 PM Thread Starter
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Re: Gas Companies and MPG

I was referred to below site by a member of another Mazda3 club.
It think it will answer some questions but not MPG.

www.toptiergas.com
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post #4 of 4 (permalink) Old 11-14-2005, 05:59 AM
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Re: Gas Companies and MPG

I have gotten bad gas from certain stations. I steer away from them. My car wouldn't idle or accelerate properly and I was lucky to get 22mpg. My usual is 26-32mpg.

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