Here's another thing to consider: Ethanol reduces emissions, but at the same time, it increases gasoline's propensity to evaporate. The extra evaporation pollutes more than the emissions that were eliminated by its presence.
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Originally posted by KMA-628
I do know he was looking at Toyotas, does that help.
Apparently the car was getting much lower mpg on the street then was advertised. At the point the car just didn't make any sense, considering the mpg of his current car.
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He was looking at a Prius, a hybrid gas/electric. The discrepancy is most likely due to the fact that regenerative braking and very light acceleration are used to achieve high numbers. The light acceleration is light enough that it is not feasible in everyday driving.