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Old 12-05-2022, 02:36 PM   #31 (permalink)
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Sport Utility Prius - '10 Toyota Prius II
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I don't seem to notice a difference over whats explained by thicker air resistance. Tahoe Hybrid you can measure ethanol content of fuel. If ethanol content goes too high on normal vehicles they will just run lean and die. They won't get worse gas mileage they just wont run or will stall out 24/7 at first fill up on e85.
From what I've heard toyota ecu's will compensate +/- 20% on afr and all of that. Maybe a toyota would run up to 20% e85 (whatever total ethanol percent that would get you). I won't test it though. lol

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Old 12-25-2022, 09:28 PM   #32 (permalink)
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Still seeing a steady drop in my MPG in my 14 Spark. Even driving at or below the speed limit. No additional warm up in the winter I'm seeing 30-34mpg fairly consistently. I've had one long trip to IL that I seen 40s again . But it's been terrible for mpg and minus a grill block I'm not molded heavily like many here. I'd love to see 40mpg all year or close to that but this is horrible .
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Old 02-03-2023, 09:29 PM   #33 (permalink)
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Originally Posted by hayden55 View Post
I don't seem to notice a difference over whats explained by thicker air resistance.
Hmmm now that I think of it, I was comparing mpg between what I thought were "basically the same" temperature (~60F vs 47F?) but the air density difference is actually a non-negligible 2% ish. So the car needs ~1% more power to move and the fuel has at least 2% less energy, so I'm only missing 4% (7% loss)...slightly colder transmission and engine oil might account for that but I have my doubts as the coolers all have thermostats built in and I blocked off much of the grille.

I'm too cheap to go fill the tank at a Shell just to see if cheap gasoline has lower density alkanes to make it cheaper, but it still feels like the gasoline is making more than a 2% difference to me.
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Old 02-04-2023, 01:30 PM   #34 (permalink)
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I think it could be the winter gas blend. I did a trip down to Arizona and filled uk with their gas, and it was around the same temp as here in Portland the week I went, but my mpg increased dramatically. Even with snow tires still on

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