As far as I am aware, for an unexplained reason, "greater than or equal to" and "less than or equal to" are two operators that are not supported in the filter function formula. In all the software development I've done in my 20 year career every system has supported the 6 basic operators and 3 logical operators.
> Greater than
< Less than
>= Greater than or equal
<= Less than or equal
!= Not equal
== Equal
It does support logical operators such as AND and OR but curiously not NOT.
It would be nice if HP Tuners also implemented the standard logical operators
&& AND
|| OR
! NOT
The reason for the need should be self-explanatory but I will provide a typical situation. Suppose you wish to graph a variable in a certain region you would add a filter function of [var]>5 and [var]<10. And in another graph you want to graph that variable [var]>=10 and [var]<15. This provides full coverage, however the greater than or equal conditional operator doesn't exist, so if you use [var]>10 then you have actually skipped over all values that are equal to 10.
Thank you for this consideration