Comments on: Gas Saving Tip #4 http://twoguysrally.com/2008/07/24/gas-saving-tip-4/ Two guys on a journey into the Rally Racing world Fri, 21 Nov 2008 18:19:50 +0000 http://wordpress.org/?v=2.5 By: Mark Ozimek http://twoguysrally.com/2008/07/24/gas-saving-tip-4/#comment-395 Mark Ozimek Thu, 24 Jul 2008 23:56:57 +0000 http://twoguysrally.com/?p=103#comment-395 I've found that it varies a lot with how I drive. The ECU will pull back ignition timing to prevent knocking when I push the engine a bit. So with the way that I drive, I'll usually see 1-2mpg better fuel economy with 93 over 87. It was a long time ago that I checked, but last time I ran 87, I found that for that particular tank compared to my usual mileage with 93, the 87 was more expensive. Of course, this varies with every car, how you drive, the weather, etc. :P I’ve found that it varies a lot with how I drive. The ECU will pull back ignition timing to prevent knocking when I push the engine a bit. So with the way that I drive, I’ll usually see 1-2mpg better fuel economy with 93 over 87.

It was a long time ago that I checked, but last time I ran 87, I found that for that particular tank compared to my usual mileage with 93, the 87 was more expensive. Of course, this varies with every car, how you drive, the weather, etc. :P

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