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adam728 · 03-19-2015, 12:09 AM

The HD engines are 8.75:1. The high output engine in the <7200 GVWR trucks was 9.4:1, you are right. I really thought there was less difference than that.

03-19-2015, 12:09 AM	#48 (permalink)
adam728 EcoModding Apprentice Join Date: May 2008 Location: Michigan Posts: 161 Mazda3 - '08 Mazda 3 S 90 day: 29.65 mpg (US) DR650SE - '13 Suzuki DR650SE 90 day: 46.16 mpg (US) Wife's - '12 GMC Terrain SLE-2 Thanks: 2 Thanked 22 Times in 18 Posts	The HD engines are 8.75:1. The high output engine in the <7200 GVWR trucks was 9.4:1, you are right. I really thought there was less difference than that. __________________