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  #13  
Old 03-30-2011, 10:54 AM
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Re: some question for overland owners

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Originally Posted by 2011RitterGC View Post
RER is a 730N Radio. Now relaced with the 730N RHR. Sounds like you GC was built in Nov or Dec of last year. As mine was it has the 730N (a $305 upgrade) with which is not listed on the sticker.
No mine was just built this month less than 3 weeks ago.
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Old 03-30-2011, 02:04 PM
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Re: some question for overland owners

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Originally Posted by mjw930 View Post
I fail to understand why people insist on rejecting the recommendation from the manufacturer simply because they think they know better......
Especially when they say the extra amount for the V-8 doesn't bother them, neither does the increased fuel consumption. But tell them to use a higher grade of fuel, and hoo boy, suddenly you've found the amount of money that will break them.
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Old 03-30-2011, 02:41 PM
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Re: some question for overland owners

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Originally Posted by jp467 View Post
No mine was just built this month less than 3 weeks ago.

Thats strange. The RER is a $305 upgrade and the RHR is a $465 upgrade. I dont think they have used the RE after about 12/20/10.
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  #16  
Old 03-30-2011, 02:47 PM
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Re: some question for overland owners

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Originally Posted by mjw930 View Post
Oh, and 91+ octane fuel DOES NOT burn hotter, that's a typical response from a mechanic who has no real training in this area of expertise.

Octane rating does not relate to the energy content of the fuel (see heating value). It is only a measure of the fuel's tendency to burn in a controlled manner, rather than exploding in an uncontrolled manner.
Good to know...the dealer guy was adamant about not using 91...didn't think it mattered. He even went so far as to saying it would damage the engine...seemed a bit extreme to me.
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Old 03-30-2011, 02:51 PM
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Re: some question for overland owners

Honestly, a daily driver will notice a significant delta in performance simply because they use 87 vs 89 octane. I seriously doubt that.
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Old 03-30-2011, 03:18 PM
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Re: some question for overland owners

Higher octane gasoline prevents pre-detonation (knocking) in higher performance engines. Most modern high performance engines, including the 5.7L Hemi, have knock detectors that tell the computer when it is starting to knock, and then the computer retards the timing so that the knocking is avoided before a human could even detect that there was any knocking to begin with. The timing retardation does affect performance and fuel economy, so to get the best performance and fuel economy you should use 89 octane gasoline.

How much does it affect it? I can't say that everyone will get the same results, but my average fuel economy on my daily commutes increased about 1 mpg (from 13.5 to 14.5) when I switched.

You pay 10 cents more per gallon for 89 octane over 87, that works out to around $2.40 per 24 gallon tankful (if you almost run it dry). At 13.5 mpg, you can go 324 miles on that 24 gallon tankful of 87 octane gas. If you were to use 89 octane gas instead and go the same 324 miles, you would only use 22.3 gallons of gas, and would have 1.7 gallons of 89 octane gasoline left. At today's average prices, 1.7 gallons of 89 octane is more than double the $2.00 you saved by filling the tank with 87 octane, so it's actually cheaper in the long run to use 89 octane, as you go further between fill ups, or at least don't have to put quite as much in when you do fill it up.
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