Don't worry about the DEF. It is not a big deal. I have been driving a truck that requires it for 3 years now and the ratio is something like 2% DEF to the amount of fuel burned. A tank lasts a long time. I used to keep it topped off but now I just fill the tank when the DIC warning indicates 1000 miles left. I think its a precise mix of water and urea.(ammonia)
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