Bill -- We are talking about an RV-12 here not an RV-7 type of aircraft. The RV-12 has a bypass/return form of fuel system with only one fuel flow sensor so the stock K Factor needs to be adjusted to reflect the bypassed fuel.
David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 (circa 1965) - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B 2020) - N124DH flying since March 2014 - 820+ hours (as of Aug 2019)!
through June 2020.