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 - Excellent for saving gasBought this for my truck to see if I could squeeze out a few more MPG. So far so good. First couple of tanks I probably increased my mileage by 1 to 2 mpg. It allows you to monitor quite a few engine functions and is not too hard to set up and use if you have a technical bent. It connects via a cable to the on board diagnostics port which is standard on all newer cars from 1996 on up. Power comes from the OBD2 port so there is nothing else to hook up. It is LED backlit and can be configured to match the color of your dash lights. Now that I have had it a few weeks I am starting to get more involved with the trip functions. It allows you to set up the size of your tank and then when you fill up, you can adjust how much it thinks you burned. This allows the unit to apply a fudge factor to try and make it more accurate. Once dialed in, it should be very accurate at telling me how much I'm getting on a tank, how much gas is left and even my cost per mile based on the last price per gallon I paid. Lastly, it will allow you to read codes stored in the computer and reset them if necessary. For the money, its probably the best diagnostic tool there is. Rating:  - great productworks well with my Honda Jazz,easy hook up does everything the maker claims the reason it gets a 4 star,is the web site should contain more info on commands and have more programmable gauges.it is difficult to come by this info on the web but still think the product is great,for the tech geeks who wants to know all those useless data that comes from their ECU HA HA Rating: - Good ProductThis is great. It has never been off by more than 1/2 gallon when I fill up. I think the most useful ones were tank MPG and miles to empty. The directions are a little jumbled. As most things you learn how to use it by toying around with it till you find what your looking for. Rating: - Great product - works as advertised...!This product is a great addition to a vehicle that is not equipped with instrumentation to observe the parameters offered by this product. However, one must work with the directions to set up the product's ability to compute miles per gallon. This is not a negative comment. The product is clever in that it uses other measurements that do not directly measuring fuel consumption. Even if you don't calibrate it to the last mpg, you quickly see the results of your driving style and it gives you an opportunity develop a driving style that can improve your mileage. Rating: - Useful but not intuitiveI bought the scan gauge for my new Smart Car to monitor gas mileage. However, you have to make adjustments to the gauge with every fill-up. For example - how much gas you put in versus how much gas the gauge thought you put in - as well as price per gallon if you want to track that info (which I can see having to do). It does install easily and gives you a wealth of info at the touch of a finger. Have not been able to adjust exactly the lght display color to match the dash lights but it is close enough.
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