New figures show spending on the Scottish Government's car service stood at £1.07 million in 2011/12 and reached a peak of 1.18 million in 2014/15.
There was a slight drop to £1.15 million last year but it still spent £243,000 hiring vehicles, a new high, and £765,000 staffing them.
A further £11,000 went on “travel and subsistence” while fuel costs fell to £79,000, according to a freedom of information request by the Scottish Conservatives.
SNP ministers spent over £1million on tax-payer funded cars
It comes just weeks after emerged motorists face being hit by crippling congestion charges and a levy to park at work as part of a new bid efforts to force Scots out of their cars.
The country's first 'low emission zones' are to be piloted by next year, which could see the drivers of 4x4s, lorries, vans and gas-guzzling larger cars banned from town centres or being forced to pay to enter.
Employers face paying a new tax if they provide a parking space for workers – with many firms expected to pass on the extra cost to their employees.
Congestion charging is also on the cards, while a set of new incentives will be devised to encourage people to drive electric cars.
The figures are revealed weeks after motorists were hit with congestion charges
Scottish Tory transport spokesman Liam Kerr said the statistics were "particularly ironic" as the country prepares to mark Scottish Environment Week.
The SNP is very happy to persuade other people to get out of their cars and find alternative modes of transport
Liam Kerr, Scottish Tory transport spokesman
He said: “Despite repeated claims to be a different kind of administration, it seems the nationalists are quite happy for ministers to be cutting around in luxurious cars funded by the taxpayer.
“Everyone appreciates the need for ministers to get from A to B, but many will question the sheer scale of these costs.
“The SNP is very happy to persuade other people to get out of their cars and find alternative modes of transport.
“Maybe it should be telling its ministers to be doing the same thing.”
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SNP ministers were taking a car journey, that only takes 10 minutes to walk on foot
Last month the Scottish Government unveiled a blueprint to slash greenhouse gas emissions by two-thirds over the next 15 years.
Ministers believe tackling city and town centre road pollution will help to cut them by 66 per cent by 2032.
In September it was revealed ministers made almost 100 journeys of half a mile or less in official cars.
The most frequent route was between St Andrew's House and the Scottish Parliament, despite the fact it only takes around 10 minutes to walk between the two buildings.
Journeys of half a mile or less were often taken in official cars
John O'Connell, chief executive of the TaxPayers' Alliance: "Scottish ministers will sometimes need official travel so that they can work on confidential documents in a secure environment but that doesn't mean that chauffeur-driven cars should be used as a matter of course.
"There are other, cheaper modes of transport that could be used when travelling securely isn't a necessity, which would save a lot of taxpayers' cash.
"All areas of the public sector should be looking for savings and government ministers should not be exempt from these expectations."
The Scottish Government said it "continually looks for ways to minimise" the use of official cars.
A spokeswoman added: “Maintenance costs have reduced by over 30 per cent and travel and subsistence by 75 per cent. We are on track to deliver savings on vehicle hire this year.
"We are committed to leading by example on tackling climate change and reducing carbon emissions, and constantly review the make-up of the fleet to ensure it is as environmentally sustainable as possible."