I haven't followed every post but is there some A-B-A testing of tabs anywhere with a measurable difference on a normal car ? I'm thinking something like coastdown tests with these attached vs not.
I know carefully designed ones deployed by carmakers have an effect, these other ones seem to have no effect at all.
BTW I'm not intending to have a go at the OP or anyone else for using them, we all want better FE and efficiency, I just think hard evidence on whether they work and, if they do, how to employ them would be useful.
I have a boxy hatchback and I will probably buy a boxy hatchback quite soon so I have an interest in knowing...
