A year ago I installed a set of Hoernor high performance tips on my 150.. They have made a world of difference.
Are the "high performance" tips any different than Met-Co-Aire's normal Hoerner tips?
I had mine installed last year at Clinton as a demonstration. I love them...
At 2,500 feet, 2500 RPM, I cruise at 100 knots.
But then, I use MMO and 2 coats of speed wax.