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What's the dealio with mpg?

545 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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Here's the wierdest thing, the GS400 actually gets better mileage than the GS300 and the IS300. That is odd, huh?
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