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What Mileage Are You Getting?

LS1 Trans Am Gas Mileage
Posted July 5 2011 08:33 AM by KevinDiOssi 
Filed under: Editorials, Kevin DiOssi

 What sort of fuel economy are you seeing in your LS1 car?

I've been driving our ’99 Trans Am for the past week and I've been looking at around 27mpg highway. This is pretty impressive considering my GTO was getting no better than 23mpg on the highway!

What are your numbers? I've heard people eclipsing 30mpg.


98 Formula with 4L60E and 2.73 gears gets 27 to 31 with better mileage being on I80 through Nebraska where the speed limit is 75 but you can cruise 80 no problem. Usually it does between 27 and 29. It was my economy car since 2004 until last year when I got a 98 GP as a winter beater.

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High Performance Pontiac
High Performance Pontiac