My wife gets 47 mpg highway in her tdi diesel. I get 43 mpg highway in her tdi diesel.
Same car, same highway, different foot :-)
Unless you have really controlled conditions I'm not sure you can be that accurate.
Winter fuel usually gives you fewer mpg than summer fuel. On a hot day the tires may be inflated to a higher pressure. There are so many little factors that could enter in.
Do you think the EPA do a better job of controilling all of that?
Just drive what gives you the most satisfaction :-)
Steve
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