I am from the US and use Budget rental for 1 way rentals, they seem to have the lowest fees.
A little bit of a hijack... How do Avis feel about one ways in the US?
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We have hired one way between those destinations before and its one of the few that doesn't usually incur a one way fee (Miami - Orlando seems to be another). We have used arguscarhire.com many times and they include most of your insurance needs and don't charge a drop fee on that route.