Just did a big trip, about 3,000km, air con on all the time, 30-36C outside, virtually no change in the FE.
I think this is an issue that shows up more with smaller vehicles, mine is a big diesel 4x4, smaller vehicles still have the same needs for auxillary load, whether it be alternator, aircon etc., but as a percentage on the fuel economy it is much bigger on smaller vehicles than on a larger vehicle.
I could delete all my auxillaries and not see much change, but if I keep the weight down and streamline the box, I can get major improvements.
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