Regarding the GM Chevrolet 2013 Cruze, below are the OEM tires and their respective "engine revolutions @ 50 mph" (EPA value: N/V). Notice however, that regardless of the rim diameter, they ALL are roughly about 35(A) or 38(M) engine rev's per mile at 50 mph vehicle speed for the same Final Drive Ratio (FDR), except for the ECO and LS models:
6-SPEED AUTOMATIC (FDR = 3.53:1):
• P215/60R16 (Firestone)....N/V = 36.5 (LS, FDR = 3.72:1)
• P215/60R16 (Firestone)....N/V = 35.1
• P215/55R17 (Goodyear).....N/V = 34.9 (ECO)
• P225/50R17 (Continental)..N/V = 35.4
• P225/45R18 (Michelin).....N/V = 35.4
6-SPEED MANUAL (FDR = 3.83:1):
• P215/60R16 (Firestone)....N/V = 38.7 (LS, FDR = 3.94:1)
• P215/60R16 (Firestone)....N/V = 37.6
• P215/55R17 (Goodyear).....N/V = 30.8 (ECO)
• P225/50R17 (Continental)..N/V = 37.9
• P225/45R18 (Michelin).....N/V = 37.9
Source: GM to EPA document, "Application for Certification 2013 Model Year", page 62:
http://iaspub.epa.gov/otaqpub/displa...d=29809&flag=1