I found from experience running my '06 Crown Vic as a daily driver for 5 years in normal driving up until this gas crunch, that during October to March, when E10 is required here, I used at least 6% more fuel, which was like losing a gallon per tank. I went from about 290 miles a tank to about 270 miles a tank with mixed driving in my commute.
They claim E10 is for reduced emissions but I am using an additional gallon per week of E10. So about 6% reduction in gas mileage.
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97 Passat TDI Wagon
Bosio 520 DLC nozzles, chip tune
Mufflerectomy, ALH Injection Pump
317k miles
Scan Gauge II
full belly pan
26 gallon tank
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