Does this work?

Saw the same thing at Autozone for less than half that price.

 

Yes it will work. Make sure you buy the correct one

 

You need scan gauge D, most motor home places stock them.

 

I am gathering your 07 doesnt have the digital screen that you cycle through. On the Century I drove there was a green screen of sorts that would list the average mpg base on how I was driving.

 

Question? Are you just wanting to know what your fuel average is? If so, you can just keep track of mileage and divide by the number of gallons of fuel, for example; 852 miles divided by 112 gals equals 7.6 m.p.g.

 

Yes, that's the most accurate way. As I understand it, the scangauge only calculates fuel usage by estimation based on injector pulse times. Many factors can make that calculation inaccurate. Things such as worn injectors, fuel temperature and fuel pressure can affect the accuracy of the numbers. I'd recommend comparing the scan gauge numbers with this method posted here.

 

Or, maybeprobably the gauge is inaccurate. For calculating average mpg it's pretty tough to beat dividing miles by gallons. If that number differs much from the gauge, I'd have to conclude the gauge isn't very accurate.