I have found that E10 costs you about 10% fuel mileage. I can only get clear Premium in Oregon so only the small engines get that. E10 premium is $3.40 and clear premium is around $4.00.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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