However, in contrast to one of his pre-election statements, he revealed that he no longer supported rent freezes in the city.
They would have belched an estimated 14kg of carbon dioxide into the air for the nine-mile round-trip, according to fuel calculators — which will take a tree eight months to absorb.
After a honeymoon first year, satisfaction ratings slumped to their lowest level last summer.
Khan won the election with 57% of the vote.