  We have compared the existing experimental data on the leading power
corrections to the structure functions $F_2(x,Q^2), F_3(x,Q^2)$, and
$F_L(x,Q^2)$ with the IR-renormalon model predictions for higher-twist
contributions. Our analysis shows that the model properly describes the
x-dependence, but typically falls short by a factor 2 or 3 as far as the
magnitude of higher twist corrections is concerned.
