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I just moved from a 2012 xB with 88k miles on it to a 2013 xB with 47k miles on it. The newer xB isn't getting the mpg's I was getting with the 2012. The newer xB is getting about 2 mpg's less than the 2012 was. Same tires, air filter, engine etc. Not sure what oil weight it has in it since its new to me. Would 0w-20 vs. 10w-30 make that much difference? Has anyone had success squeezing a few more mpg's out of their xB, and if so, what did you do that made the difference?
 

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First of all, why would you trade your XB with less than 100K? My grandson has a 2009XB with 228K and it is still going strong. NEVER USE ANY OIL IN YOUR XB OTHER THAN 0/20 OR 5/20! 10W30 has a viscosity that is to thick to flow in your XB. You run the risk of causing the engine to fail. If you are worried about gas mileage, control your right foot and drive less aggressively. You may put 2 t0 4 oz. of Marvel Mystery oil in your gas fill up and it could help a little in your mileage.
 
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