Evaluate the test results by comparing these four numbers to the manufacturer’s recommended specifications. If the Honda CR-V is a 2007 or 2008 model, the compression ratio is 9.7: 1. For model years between 1999 and 2006, the ratio is 9.6: 1. If the SUV is one of For early models, 1997 or 1998, the ideal ratio is 9.0: 1. Compression numbers should be within 15 PSI of these suggested ratios.