It would seem you are not LOP at this power setting, and in fact may be in the red box described by GAMI as within 50*F ROP, which is the place you do NOT want to be in regards to engine power settings and destructive effects.  A GAMI Lean Test at 28"/2400 would define each cylinder's peak (should be <0.5 gph spread) and the fuel flows to best serve your needs.

Jeff L
LIVP


From: Guy and Jill Foreman <guyjill01@hotmail.com>
Subject: Why is my fuel burn so high in my IV ????
Date: November 2, 2012 7:50:50 AM EDT
To: lml@lancaironline.net


Reading some of the posts on the LML about IV/IVP drivers. Just wondering how they are getting around 18-19 GPH at cruze power?

I have a straight IV with a TSIO-550-B. I usually fly around 10K feet, using 28in MAP, 2400 RPM, Leaning to 1550 TIT, and getting 21.5 GPH fuel burn.

What am I doing wrong? How is everyone else getting there fuel flow so much lower?

Any advice would be much appreciated.

Thanks,
Guy Foreman