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Ford updates Power Stroke diesel V8, strengthens F-450, tweaks King Ranch

Ford is giving its F-Series Super Duty trucks some upgrades for 2015, and we're happy to say that one of them is an improved Power Stroke diesel V8. Also, Ford is strengthening the top-of-the-line F-450 to handle more abuse. And if wild west-style luxury is your thing, the automaker has performed minor cosmetic updates to its King Ranch Edition trucks, as well.
The turbocharged 6.7-liter Power Stroke V8 is currently rated at 400 horsepower and 800 pound-feet of torque, and Ford only tells us the new and improved Power Stroke can "produce power beyond today's" engine. What, then, did Ford actually improve upon? First, the Blue Oval swapped in a new, larger turbocharger. The new Garrett GT37 turbine unit is 72.5 millimeters in diameter, eclipsing the old GT32's 64-mm diameter piece. Ford states output increases with the new turbo setup, but since the new turbocharger operates at a lower peak pressure than the old one, the automaker was able to eliminate the wastegate system and reduce the engine's complexity. Ford even redesigned the turbo's oil and cooling lines to make the powerplant simpler. A byproduct of the larger turbo is better engine exhaust braking, which is controlled manually by a button on the dashboard.
Ford claims the upgraded diesel engine is more powerful, more robust, more efficient and more refined than before.

American automakers fall in latest Fortune 500 rankings

Not that it means anything beyond bragging rights, but if you're fixated on the positions of domestic automakers on the annual Fortune 500 list, both General Motors and Ford are still on it but they've slipped a couple of notches. The list ranks American companies and they're ordered solely by revenue. GM, fifth last year, came in seventh, while Ford fell from ninth to tenth even though both companies saw small gains in annual revenue.
GM's $152.3 billion in revenue was less than a third of that of the first company on the list: Wal-Mart, which regained the title from Exxon Mobil. Berkshire Hathaway and Apple are the firms that moved GM down. Ford, displaced by energy company Valero, had $134.3 billion in revenue.
On a side note, profitability isn't a factor, but both GM and Ford were down in this year's list compared to last year's: GM declined from $9.2 billion to $6.2 billion, Ford fell from $20.2 billion to $5.6 billion. If profits were included, Exxon Mobil would probably still be king: although the energy company made almost $20 billion less in revenue than Wal-Mart's $469.2 billion, it posted $44.9 billion in profit compared to Wal-Mart's $17 billion.

Feds looking into Ford Explorer exhaust leak complaints

There may be a burgeoning problem with exhaust leaks in the 2011-2014 model year Ford Explorer. The National Highway Traffic Safety Administration is examining multiple complaints of a gasoline smell in the cabin of these SUVs. However, the exact cause of this problem is still unknown.
"The agency is reviewing all available data and will take appropriate action as warranted," said a NHTSA spokesperson in an email to Automotive News. Owners seem to generally complain on the regulator's website of the smell entering the cabin through the air vents. At this time, the government organization has not yet opened an official investigation into the problem, though. When it does begin inspecting vehicles, NHTSA posts a detailed breakdown of its public data online.
Similar problems have been reported about the Explorer in the past, though. In 2013, Ford issued a recall for the 2013 model year of the SUV due to a fuel leak that could cause drivers to smell a gasoline odor and repaired them again later for another possible leak. In response to Autoblog's questions, Ford responded via email: "We are not aware of a NHTSA investigation. We are currently reviewing the case and in the event that any action is required, we will address it promptly."