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It says "When a unit with this tactic Advances or makes a charge move, add 1 to the Advance roll or charge roll." My emphasis.
My reading: Biker units get no benefit from this while advancing, since they do not roll for advancing, but automatically move 6"? (or any other unit with a similar ability?)

edwardmyst wrote:
It says "When a unit with this tactic Advances or makes a charge move, add 1 to the Advance roll or charge roll." My emphasis.
My reading: Biker units get no benefit from this while advancing, since they do not roll for advancing, but automatically move 6"? (or any other unit with a similar ability?)

RaW you are correct, you add a set value "instead of making an Advance roll."

Would you be surprised to find out GW made a Special Snowflake FAQ for the Ork trait that does the same thing?

WARHAMMER 40,000 CODEX: ORKS Official Update Version 1.1 wrote:Q: Do Evil Sunz models that have a set value when they Advance – like a Deffkilla Wartrike using the Fuel-mixa Grot ability or a Deffkopta, due to Turbo-boost – also benefit from the Red Ones Go Fasta kultur?
A: Yes, add 7" to their Move characteristic for that Advance move in these cases.

So, right now, SM don't get to benefit and Orks do.

Thanks BCB...just got to love the way GW cross checks things...