Full service! What exit?
All exits.
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In both New Jersey and Oregon, it is legal for customers to pump their own diesel (although not every station permits diesel customers to do so; truck stops typically do)
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Motorists occasionally pump petrol into a diesel car by accident. The converse is almost impossible because diesel pumps have a large nozzle (15/16 inches) which does not fit the (13/16 inches) filler. However, it is possible and does happen occasionally. Diesel in a petrol engine however — while creating large amounts of smoke — does not normally cause permanent damage if it is drained once the mistake is realised. Even a litre of petrol added to the tank of a modern diesel car can cause irreversible damage to the injection pump and other components through a lack of lubrication. In some cases, the car has to be scrapped because the cost of repairs exceeds its value. The issue is not clear-cut as older diesels using completely mechanical injection can tolerate some gasoline — which has historically been used to "thin" diesel fuel in winter.
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Oregon's Department of Environmental Quality has also ordered a ban on self-service gasoline due to inexperienced pumpers being a significant source of groundwater and air pollution. Oregon's state fire marshal has also ordered a ban on self-service gasoline. Today, these states enforce the law because of the rapid increase of drive-offs[citation needed], where people fill up their car and drive away without paying for gas.
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Mandatory full-service is partly why NJ gas prices are so much cheaper -- the stations save so much on insurance (because "unskilled" gas-pumping drivers are far more dangerous than the highly trained employees) that it more than offsets the minimum-wage attendants. Because insurance costs are spread across all the stations, this offset only works if ALL the stations (or at least a sizeable majority) have full-service, which is why it doesn't work on a station-by-station basis in other states.
Our state tax is low as well so that has an effect on gas prices. But even taking that into account, we still have relatively cheap gas at full service compared to other states.