Thread: Low Gas Mileage
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      10-12-2018, 01:57 PM   #15
Lieutenant General

Drives: BMW F11 535i Touring
Join Date: Mar 2007
Location: Scotland, Highland Region

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Originally Posted by dchuck84 View Post
I agree that 400+ pounds will have an impact on gas mileage. However, my concern is that the fuel only MPG is rated twice as much than it actual is... 15mpg vs 29mpg is a huge difference.

Are you really replicating the conditions of the rating? Is this actual mpg, or simply an OBC reading? Is your battery getting charged during the high fuel use?

What mpg does the car return on a highway cruise with a depleted battery? That is more a gauge of whether there is something wrong, than in urban driving, which is so personal to you and your driving conditions.