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What's the dealio with mpg?

547 Views 4 Replies 5 Participants Last post by  JW
As far as I understand, the IS uses an engine similar to the GS300; why is it then that the GS gets marginally better gas mileage even though it weighs 300 lbs more and has 5 more hp? I is confused...
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Long ago, I posted a link to a URL that describes how the EPA does mileage testing...and get this, they don't actually measure the volume of gasoline consumed. Instead, they measure the emissions from the exhaust, and I guess there's some formula to figure out the mileage. How wacked out is that?!

Here's the URL (you'll need a .pdf viewer like Acrobat):
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