I wouldn't worry too much. We British are pretty familiar with 'americanism' so we are unlikely to be confuse by gas or a fawcett.
Your car's hood is our 'bonnet'. Your trunk is our 'boot'.
Corgette is the same vegetable as zucchini.
Our 'fag' is your cigarette.
Your 'elevator' is our 'lift'.
Your 'theater' is our 'theatre' except we go to the theatre to watch plays and the cinema to watch movies.
Your potato chips are our 'crisps'.
Your 'jelly' is our 'jam'.
We both eat sandwhiches but sometimes we call ours 'butties'.
Your beer is weak and tasteless.
Your car's hood is our 'bonnet'. Your trunk is our 'boot'.
Corgette is the same vegetable as zucchini.
Our 'fag' is your cigarette.
Your 'elevator' is our 'lift'.
Your 'theater' is our 'theatre' except we go to the theatre to watch plays and the cinema to watch movies.
Your potato chips are our 'crisps'.
Your 'jelly' is our 'jam'.
We both eat sandwhiches but sometimes we call ours 'butties'.
Your beer is weak and tasteless.