Fuel Flow EGT

Two years ago I replaced my old 914 (2005 vintage with 1200 hrs) with a new 914 from LEAF.  The new engine has 200 hours now.  Since day one the fuel usage has been high, about 6 gph rather than 5.5 per the book and experience with original engine.  Likewise EGT 1 seems to run nearly 200 deg cooler than the others and those plugs look pretty black.  Interesting when I look at data during climb, 5500 rpm 35 in MP, the EGTs are pretty uniform, but in cruise 5000 rpm, 31 in MP is where I see the difference.  LEAF had me send the carbs to them to verify there were no problems and they had the jets and needle settings called out on the intake.  The problem has continued since then (probably 100 hours).  Using an extra .5 gph is a problem when making long cross country flights and trying to always use auto fuel.  Looking for ideas.