Hyundai i10 Owner's Manual page 184

Driving your vehicle
Load-pulling components such as the
engine, transaxle, wheel assemblies, and
tyres are forced to work harder against
the load of the added weight. The engine
is required to operate at relatively higher
speeds and under greater loads. This
additional burden generates extra heat.
The trailer also considerably adds wind
resistance, increasing the pulling require-
ments.
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