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Technology / Re: How does my car calculate fuel economy?
« on: Today at 01:06:41 »3 and 5 i think will be the same thing too! Catalytic converters run on a fuel rich mix in the engine, so a slight uptick in oxygen persentage may yield results, especially if the fuel air mix is set for a high atmospheric pressure/ low humidity/low temperature senario, that is if these modern cars themselves do not automatically adjust for humidity, temperature and pressure
I would only rate 1,3 and 7 as having any significant effect, but way less than a STRONG headwind/tailwind.
As alan points out, a round trip is unlikely to yield wind or gradient advantage. Talking of gradients, i have often wondered if someone who lives in london achieves better mileage than someone who lives in sheffield, as the latter is quite hilly, all that braking to keep within the speed limit must add up. Its not all down hill from here though.