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- Neil
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My car (2.2TDCi) sits at around 1800rpm at 70mph in 6th, turbo would just be starting to spin up at 1700. It will happily pull in 6th from 50mph or approx. 1500 rpm. even more so now with a bigger intercooler and remap.Also, I have found modern diesels are terribly fuel hungry simply from bad gearing where as an example a 2.0 Audi Diesel the 6th gear sits at 70 below the turbos main boost region (way below in fact!) so the engine is technically always choking when you come to any climb.