Mark one answer
It can make the engine difficult to start
It can improve your vehicle's fuel consumption
It can increase the level of exhaust emissions
It can make the roads slippery for other road users
Explanation: Diesel fuel can spill out if your filler cap isn't secured properly. This is most likely to occur on bends, junctions and roundabouts, where it will make the road slippery, especially if it's wet. At the end of a spell of dry weather, road surfaces may be especially slippery where diesel has been spilled but it hasn't been washed away by rain.
Category: Attitude
References: The Official DVSA Guide to Driving: Section 4, Highway Code: Page 130
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