Is there evidence that the new engine is more economical than the old one?

A company is trying a new engine in its buses and has gathered the following random samples of miles-per-gallon figures for the old engine versus the new:
Old engine: 8, 9, 7.5, 8.5, 6, 9, 9, 10, 7, 8.5, 6, 10, 9, 8, 9, 5, 9.5, 10, 8
New engine: 10, 9, 9, 6, 9, 11, 11, 8, 9, 6.5, 7, 9, 10, 8, 9, 10, 9, 12, 11.5, 10, 7,
10, 8.5
Is there evidence that the new engine is more economical than the old one?

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