Re: just spitballin'..
I don't know about MDS but while ever the cost of oil remains high, engine efficiency will improve. The most efficient diesels are the low speed marine diesels. They have a thermal efficiency of about 50%. The high speed turbo diesels we have, have a thermal efficiency of only about 40%. So there is a long way to go before diminishing returns start to kick in. How they we get the efficiencies is unlikely to be obvious at this point.
Ordered 9 Nov 2011 - Delivered 3:30pm Friday 13 April 2012
Jeep Grand Cherokee Laredo 3L CRD, Black Forest Green Pearl, Quadra-lift, Off-road Adventure II, Front Recovery Hook, Mopar Tow Bar, Mopar Rock Rails, 150A Projecta Battery Isolator, Tekonsha P3 Brake Controller, Bridgestone D697 265/60R18 LT, Kimberley Kamper Special Edition
MudMap M7 off/on road sat nav, Chief front recovery hooks "chrome", Chief 3mm bash plate