Words ending in a vowel plus ‘I’

In British spelling, verbs ending in a vowel plus / double the / when adding endings that begin with a vowel. In American English, the / is not doubled:

USBritish
traveltravel
traveledtravelled
travelingtravelling
travelertraveller
fuelfuel
fueledfuelled
fuelingfuelling

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Grammar and usage