Group Mean n Std. Dev
87 Octane 22.570 4 3.5575
89 Octane 22.5500 4 3.2254
91 Octane 25.8000 4 4.2716
Ethanol 5% 22.7500 4 4.5625
Ethanol 10% 21.8250 4 3.5874
Compact 28.0200 5 2.0130
Mid-Size 25.4200 5 2.3392
Full-Size 21.1600 5 1.4293
SUV 20.2000 5 2.7911
Total 23.7000 20 ?