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Your friend is stretching the truth. Not just a little, but a whole lot. Your right foot can do more than anything else to increase your mileage. Period.
Synthetic oil can help, but not anywhere near 5 mpg. If synthetic oil helped that much everybody would be using it. It would be common knowledge. Synthetic oil has been around for decades. Your friend hasn't stumbled on to something that the rest of the country is just too dumb to realize.
Synthetic oil can help, but not anywhere near 5 mpg. If synthetic oil helped that much everybody would be using it. It would be common knowledge. Synthetic oil has been around for decades. Your friend hasn't stumbled on to something that the rest of the country is just too dumb to realize.