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Old 09-19-2022, 12:00 PM   #7 (permalink)
Caddylackn
EcoModding Apprentice
 
Join Date: Jun 2022
Location: Bremerton, WA
Posts: 104

Passat TDI Wagon - '97 VW Passat Wagon TDI
90 day: 55.81 mpg (US)

Blue - '21 Hyundai Sonata Blue
90 day: 53.79 mpg (US)
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My real world day to day experience with the switching to 10% ethanol fuel around October, is I lost about 25 to 30 miles per tank in range. In the summer, I could go about 310 - 315 miles commuting before the fuel light came on, then in winter the fuel light comes on around 280 - 288 miles or so.
This is in my 2006 Crown Vic PI, with a 19.1 gallon tank (fuel light goes on with 16.1 gallons used), which was last year's daily driver. My Crown Vic isn't stock, I have a bunch of performance mods, run a performance tune, and use premium fuel.

So adding 10% ethanol and colder temps = more than 10% loss in gas mileage. Some of this loss is also driving in the rain, which is about 80% of the time around here after October.
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97 Passat TDI Wagon
Bosio 520 DLC nozzles, chip tune
Mufflerectomy
306k miles
Scan Gauge II
full belly pan
26 gallon tank
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