ok targeting the keyword (used cars for sale) i went on google keyword tool and the monthly search volume is 4.000.000 i then go on the google sktool and do the same search and its only 120.000 both where searched with the exact filter and the uk as country how can there me such a margin between the 2 one of them one of them is massively wrong can anyone explain this to me im lost also another thing when i sign in to the google sktool and do the search it only comes up 15.000 search volume why is this thanks