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I can speak to ABA testing on a:
1999 Jaguar Vaden Plas (4.0 liter 4dr stretch sedan)
and
2002 Infiniti Q45 (4.5 liter 4 dr sedan)
At 65 over a 7 mile flat stretchof highway in texas, I suffered a 4 mpg LOSS with windows down and A/c off in the jag
and a 3 mpg loss in the infiniti
I leave the a/c on all the time in the infiniti. My best mpg ever (32mpg at 55) over 7 mile testing up and back was w/ a/c on.
I agree that the smaller engines might suffer.
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