[hat_man]

I appreciate all the information, but I don't want to get so focused on the fine details that the bigger picture is lost. Things like metallic make up of blocks, pistons, and rings or the differences in pistons speed at TDC/BDC compared to mid stroke are great information and again I very much appreciate it, but for the average coroplast and duct tape Ecomodder it might be information overload. I would hate to try and figure the ROI from changing ones bore or stroke or replacing piston ring with something thinner. But using formulas like this one for piston speed as it relates to RPM (and by extension FE) and one to show RPM at any given speed/gear/tire size , someone could find out that driving in a different gear (manual transmission) might return better results than how they currently drive. Some SIMPLE math might help tighten up the nut behind the wheel, so to speak. Or, for the adventurous, finding a rear gear or tire size change that "dials in" their vehicle for better FE.

Again the information on the minute details will probably help someone, but keeping the bigger picture in focus might be for the greater good.

I worked up some numbers and have a couple of questions but I'll post those later tonight. If anyone want to jump in and help feel free. Thanks.