This is the first time I use my miles for upgrade. Here is some details of what happened. I bought my ticket lax-IST-bey as a cc ticket. The IST-bey portion was on Eco. Miles fro that segment on Eco is 605 (lower than last year). The tk site shows that comfort class for such segment is worth 756 miles.
R the miles calculated based on the seat or the total ticket I bought.

Also I used miles to upgrade that seat to business. Do I only get the Eco/cc miles or do I get the business miles?

Thanks for the help.