Sorry, but this device doesn't deliver what it promises. I had high hopes that this would help my very nice 2011 Ford Explorer XLT SUV with the 3.5 liter 6 cylinder engine. I got 22 to 24 mpg before I installed the fuel economy unit. I rode it for a couple of weeks but didn't see any improvement and it actually broke on the same tracks. So it is NOT as expected and I am planning to return the device for a refund. So my recommendation - DO NOT buy, DO NOT waste money - it's not worth it!
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