Winter blend or the temperature impacting MPG?
Been watching my mileage increase over the last 3 months from a low of about 15.80 (on the coldest week of the year) to 17.91 the last tank. According to my gas station, they still have winter blend until may. I don't let it run to warm up (heated garage) and use the block heater below 0 degrees. No changes to the truck so wonder if it's the blend or the temp?
2003 F350SD 7.3L CCSB
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