They were La Paz, Bolivia -- Dar Es Salaam, Tanzania -- New Delhi, India -- and Sydney, Australia.
Petrol seller in Bangalore, India: www.flickr.com/photos/mattlogelin
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We asked reporters to check local gas prices. First up, Ruxandra Guidi in Bolivia...
Listen to all of the reports
So -- among the four cities we visited -- the price of gasoline was highest in Tanzania's capital -- at 5 dollars and 6 cents a gallon.
Which makes Dar Es Salaam the answer to our Geo Quiz today.