Wrong Fahrenheit/Celsius conversion in the manual?

[MtheHell]

I'm wondering, if there's a mistake with the conversion of the degrees in the manual - or do I miss something why they don't match?

I'm looking to the leaning advice with the EDM-760 and e.g. in the ROP section, the manual reads (page 130):

• "Lean Find mode is now armed, and an approximately 15°F (8°C) increase of average
  EGT has been observed."
• and later: "At cruise power settings, this point is approximately 50-100°F (28-56°C) below peak EGT for
  best power."

When I convert °F to °C, I get these results:
15°F = -9,4°C
50°F = 10°C
100°F = 37,8°C

Vice versa with the °C (above in brackets) converted to °F:
8°C = 46,4°F
28°C = 82,4°F
56°C = 132,8°F

I can use Fahrenheit in the EDM to get my peak temps and then aim for the 50°F, but I don't really know which °C values I should aim for when in Celsius display mode?

[Randolf]

@MtheHell the problem here is that degrees Celsius and Fahrenheit have different zero point, so yes, 15 deg F above zero is approx. equal to -9.4 deg C below zero, however, if you are measuring relative change in deg C and F at around 200 C (392 F), if add 8 deg C, you get 208 C = 406 F, which is increase of 14 F (all values approximate), so the manual is about right. Just use either C or F as stated in the manual and don't mix them :)

[MtheHell]

@Randolf Ahhh..! You see, I thought, there must be a reason for the differences.
Thank you for clearing up the context. Then I stick to the numbers and feel good with it:)

[Raller]

And at -40 the two scales meet. Perplexing :-)