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I sure as hell did and I owned that car for a dang long time. I tracked the mileage for way over a decade. Since I used another vehicle as a winter beater, the temps it was driven in were very moderate and not cold weather use which can really drop fuel economy.
I lost right around 3 mpg with that car. I was just extrapolating that newer cars that get better fuel economy and the ability to dial back or advance timing better could have even more significant differences. I have a Honda H-RV right now and even though much smaller, it doesn't really do much better then that 1998 Regal did when it comes to fuel economy.
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You don't lose 3-5 mpg running on E10. Possibly on E85.
I sure as hell did and I owned that car for a dang long time. I tracked the mileage for way over a decade. Since I used another vehicle as a winter beater, the temps it was driven in were very moderate and not cold weather use which can really drop fuel economy.
I lost right around 3 mpg with that car. I was just extrapolating that newer cars that get better fuel economy and the ability to dial back or advance timing better could have even more significant differences. I have a Honda H-RV right now and even though much smaller, it doesn't really do much better then that 1998 Regal did when it comes to fuel economy.
Then your car defies the laws of physics. E10 fuel contains about 2% less energy than E0. For a 30mpg vehicle, I could see you losing MAYBE as much as 1mpg but considering that most E10 gasoline contains UP TO 10% ethanol, some fillups likely have been running on less than E10.
E85 contains about 28% less energy than E0. If you could use E85 in that same 30mpg vehicle, I could see losing about 8mpg or so.
Many reformulated gasoline mixes used to contain MTBE as an oxygenate. MTBE was replaced with ethanol. 10% MTBE gas has slightly LESS energy than 10% ethanol gas....although not enough to be significant when it comes to mpg.
The laws of physics are laws not suggestions.