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Well this is a fail, I successfully got the EGR valve to open up more but I needed quite a bit more load to maintain 60mph today compared to yesterday. The problem with this car is that it cools the oil with ambient air, has short gearing and a massive gearbox made for V12 cars so the friction forces completely dominate.
I have no idea if my bad mpg today is because the fluids were a little colder, if the ECU isn't adding spark timing, or if I'm actually losing engine efficiency with my tweaks. I want to say I probably lost engine efficiency because the difference seems significant, but I really have no idea...
I think I need to add more EGR to see if the engine is actually advancing the spark timing, because if it's not then that would easily explain the loss in efficiency. For now I've only added around 2% more EGR which is kind of negligible, whereas if I get closer to 5% it should show up.
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