Chrysler recommends that both be run on 87 octane unless you're experiencing
excessive pinging which can be caused by heavy loads, bad gas, carbon
build-up, or as we have seen in the various TSB's, there are also other
mechanical reasons. I've only run 87 octane in my 2000 5.9L so far without
problem.
Regards, Mike Klinke
-----Original Message-----
From: Bob H. <dakotacab@yahoo.com>
To: dakota-truck@buffnet.net <dakota-truck@buffnet.net>
Date: Sunday, January 07, 2001 12:40 PM
Subject: DML: RE: Was MPG--Now: What octane?
>Just wondering what octane gas the 5.9 and 4.7
>require.
>Thanks,
>Bob H.
>
>--- John Bell <dak@mama.indstate.edu> wrote:
>>
>> ""Bob H."" <dakotacab@yahoo.com> wrote in message
>>
>news:20010105042309.7793.qmail@web11805.mail.yahoo.com...
>> > Ok, here are a few more questions.
>> >
>> > Gas Mileage:
>> > 5.9 w/ 3.92 =
>> > 5.9 w/ 3.55 =
>> > 4.7 w/ 3.92 =
>> > 4.7 w/ 3.55 =
>> > Please specify automatic or manual on 4.7
>> >
>>
>> Heyya Bob,
>>
>> I have a '00 QC 4x4 with the 5.9, 46RE auto and a
>> 3.92 rear axle - 7300
>> miles.
>> I am getting around 12-13 mpg on 89 octane gas with
>> mixed city/hwy driving.
>> My high is 16 mpg on a trip to Houston, low is 10
>> mpg chugging around in
>> stop
>> and go when I got her new... the engine's looser
>> now, which makes a
>> difference
>> (right around 4000 miles).
>>
>> Hope this helps,
>> --
>> JB
>>
>>
>
>
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