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From: dr_jeff on 5 Dec 2009 07:19
Ray O wrote:
> "ron" <randus3(a)teranews.com> wrote in message
> news:q9gSm.40074$ZF3.8698(a)newsfe13.iad...
>> I think I heard or read one time that lower octane gasoline actually made a
>> bit more btu's/unit, is this true Ray?
>>
>> --
>> Merry Christmas
>>
>> Ron
>
> The BTU content of regular and higher octane fuel is the same if the only
> difference were octane content. Premium fuels usually have other additives
> besides octane, which muddies the comparison somewhat.
>
> Higher octane fuel allows ignition timing to be advanced more and
> compression to be higher, both of which allow the engine to burn the fuel
> more efficiently and increase performance.

That's true. However, the keyword here is "allows." That means it works
for some engines. And not others. It all depends on the design of the
engine and the software running it.

Some cars will have better performance with higher octane fuel while
others won't.

Jeff
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