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I have about 900 miles on my CX3 and have so far gotten 30.5mpg.

Today I filled up. It said that I had 305 miles until empty. I figure that is 10 gallons until it shows empty, and they I will have about 2 gallons left. How many miles is that good for?

With my old car I drove it until I ran out of gas, noting how many miles past empty I got. (28 miles). I then put 2 gallons in and trusted I could make it to a gas station. I was told that was a terrible thing to do, as it would suck all the crud off the bottom of the tank. Don't know if that is true, but with 900 mile it should not have much crud, so the time to do it is now.

What do you think about all this?
 

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Its hard to say on what you may get with two gallons of gas as there are different factors to considered. With that being said I will address two things. First is I managed about 23 miles from the gas light being on to no ticks on the fuel meter. Second is about the whole "sucking up crud" running the fuel that low. Although being a new car so there may not be much stuff in there you do run the risk of damaging your fuel pump as it begins to strain in sucking up fuel which I can guaranty is one really expensive and two may not be covered under warranty. So try to be warry on running your tank that low.
 

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Many cars cool the fuel pump by immersing it in gasoline. If there's no gasoline, the pump could overheat. This won't likely cause it to fail right away but you could shorten its life.
 

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I've heard it's not good for the injectors to run dry, even for a short period of time.
 
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