What have we done to improve 5s mpg?, Anything you've done to get better mpg out of your 6g Options

[ricochet1490]

My initial thoughts on this would be to make some clear (as to not detract significantly from the look of the car) body panels to improve aerodynamic efficiency... but I have a separate thread for that http://www.6gc.net/forums/index.php?showto...mp;#entry928769

I post here however to discuss engine mods. Any ideas or thoughts on this? I was thinking of maybe advancing the ignition timing a bit to burn hotter, increase hp and hopefully mpg, but idk. Does a good CAI help? or a larger O.D. exhaust? What have you guys done?

[ricochet1490]

i could envision that after a certain point, pressure reduction and centerline velocity reduction could cause something like and Eddy current to come about if the velocity of the gas was just right. I think this is where the complications of gas fluids and liquid fluids come into play however and experimentation is required. azian, I tried to get your ppt but it wanted me to install some .exe program read the file so I never did it, but I am interested.

either way, if what you're saying is true, it makes sense to reason that more hp produced at a given rpm/level of fuel consumption = better mpg
So, the larger exhaust could be a drop in hp and worse gas mileage, but a turbo if driven the same could yield better? I can only assume ford and chevy have recognized this fact with the recent production of the supercharged 4 cyl cars. The CMAX in europe and soon to be the Focus in the states. Already in the Cruze. All have small supercharged 4cyl and get 40mpg or so.
I figure increased mpg would be true of advanced ignition timing as well though right? I mean, burning it earlier and hotter tends to provide more power (at the expense of your valves), so it should also yield mpg then. There is a nicr write up here Timing about his findings on advancing timing. I don't think he mentions mpg, but with ^ hp i would expect to see ^ mpg if we assume the above.