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Another consideration should be the temperature. If you are going out in 70 degree weather in Florida that will be different than 20 degree...
In the debate about when to fill up, some have said to just use the MFD for your calculations. I think that might be risky, and I would give at...
I too have been trying to decide which synthetic to run in the Prius. I ran Mobil1 15W-50 in a Honda Rebel 250 motorcycle after a break-in period...