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Eh, What? In neutral rolling down the hill... Where do you think the fuel is coming from to keep the 900 revs??? Throttle may be cut but the ECU is still supplying fuel to let it idle mate.
But in say 4th, on a downhill section with no throttle the ECU cuts ALL fuel as the momentum turns the...
Because in neutral, rolling down the hill you are wasting brake pads and fuel. The injectors are still getting fuel to idle the engine. In gear, the engine is spun by the momentum and the ECU cuts the fuel - that's why the MPG gauge goes high.
Always. ECU's cut fuel to the injectors when you do it. The Road momentum turns the engine.
Same with a big hill, drop a gear or two so you lose no speed and coast down, fuel is cut.
Download the latest ones.
Goto Programs and Features in Control panel and uninstall all ATI drivers (Catalyst ) you can find... then download the new suite and try that. Never had an ATI card die on me yet.
The spec is almost what I have sat at my knees right now.
i7 4770K 1150 Haswell.
16GB Vengeance Ram.
HIS HD 7970 GFX
TX750 Corsair Power
400GB would be awesome on SSDs (But that would be barmy cost!)