span> <span class="fu"><a href="https://rdrr.io/r/base/factor.html" class="external-link">factor</a></span><span class="op">(</span><span class="va">carb</span><span class="op">)</span>,</span>
<span>         `liter/100km` <span class="op">=</span> <span class="fl">1</span><span class="op">/</span><span class="op">(</span><span class="va">mpg</span><span class="op">*</span><span class="fl">1.6</span><span class="op">/</span><span class="fl">4</span><span class="op">)</span>,</span>
<span>         `-disp` <s