If you used mid-grade or Regular unleaded and did not get any pinging, then
you are throwing your money away using the Premium grade. The difference in
the fuels is the octane rating and the only thing that octane does is
increase the temperature at which the fuel ignites. If your engine does not
show signs of pre-ignition using regular fuel, then you are not gaining
anything by using higher octane fuels.
Joe
-----Original Message-----
From: spitfires-bounces@autox.team.net
[mailto:spitfires-bounces@autox.team.net] On Behalf Of Jeff Scarbrough
Sent: Monday, December 28, 2009 7:19 AM
To: v6spitfireguy@cox.net; spitfires@autox.team.net
Subject: Re: [Spits] Some 1500 questions
I've got a 76, I assume it's 9:1. I use premium fuel.
The cost difference around here is about 12%. That means, at 25 MPG,
it costs an extra $12 to go a thousand miles. If I couldn't afford
that, I couldn't afford a Spitfire. I have used regular and
mid-grade, but not in the hottest part of the year. I didn't notice
any problems, though.
Of course, in sunny San Diego, it'll be a little more expensive. But
it's been my experience that higher octane fuel is available most
everywhere. You could store a bottle of octane boost in the boot for
emergencies.
Jeff Scarbrough 75 TR6 x 1, 76 1500 x 2, 78 1500 x 1, 80 1500 x 0.5
http://www.fishplate.org/vehicles/
Corrosion Acres, Georgia #354
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