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The cheapest and easiest way I was able to extract more power and better fuel economy in my Cruze was by switching to premium gas. The 1.4L engine is turbocharged and with more compressed air, comes higher intake temperatures, especially in the summer. Higher octane fuel has higher resistance to pre-detonation. The Cruze will retard the timing if it senses pinging/knocking so it will run on lower octane, but it really prefers to be treated to 89+ fuel. I run 93 in mine and I saw a 15-20% increase in fuel economy when making the switch which negates the extra cost. It's worth a try, you can always switch back if you're not satisfied.
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