I know it sounds like a lot but in my experience the difference is mostly a fixe... | Hacker News

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Huppie 9 months ago | parent | context | favorite | on: Over 80% of sunscreen performed below their labell...

I know it sounds like a lot but in my experience the difference is mostly a fixed offset plus a tiny percentage due to tire pressure/size.

A fixed 2mph difference at 20mph is 10% so imho they're at least _technically correct_.

madog 9 months ago [–]

5% at 70 mph is 3.5 mph

10% at 30 mph is 3 mph

I saw this with various European cars.

My experience is that it seems to be a fixed percentage rather than a fixed amount i.e. the absolute difference increases with speed.

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