A small-displacement car consumes 6 liters of fuel per 100 kilometers, and another large-displacement car consumes 9 liters of fuel per 100 kilometers. For the same driving distance of 30 kilometers, how many liters of fuel can be saved by a small-displacement car compared with a large-displacement car?
一款小排量轿车每行驶100千米消耗燃油6升，另一款大排量轿车每100千米燃油9升．同样是行驶30千米的路程，小排量轿车比大排量轿车节省燃油多少升？
<gadget id="calculator">9 / 100</gadget>
<output>9/100 = around 0.09</output>

<gadget id="calculator">(9/100) * 30</gadget>
<output>27/10 = around 2.7</output>

<gadget id="calculator">6 / 100</gadget>
<output>3/50 = around 0.06</output>

<gadget id="calculator">(3/50) * 30</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">(27/10) - (9/5)</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>