I don't follow your logic on how diesel has to beat gasoline figuers by 10% just to break even... Diesel fuel has a higher BTU content than gasoline. Then traditionally a diesel engine had about 10% greater thermal efficiency to start with... The offset was that maintenance costs a bit more and the purchase price was higher... If these new direct inject gas engines gain considerable efficiency then that will change the balance.
As far as why people let diesel's idle... Number one... A turbo engine should idle 3-5 minutes before shutdown if it's been pulling. This to allow the turbo time to spool down and temperatures in the head and manifold to stabilize. It's only in more recent times that this has not been specifically recomended... seemingly at the continous expense of 3500 dollar turbo's. The other factor... when you've changed enough starters or dealt with engines that barely had enough starter.... or engines that would crank OK cold but not when they're hot... then you'll understand why so many people let diesel's idle. A little bit of idle is better than a tow home.
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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