Re: ELECTRONIC TRANS.
1. Traction Control (TCS): Essentially an electronic module that determines wheel slip/spin. As a tire loses traction, TCS essentially reduces power to that wheel until it regains traction. It has no effect on MPG's. TCS is essentially a safety feature inteded to "idiot proof" the car; however, for anyone that does any type of racing or has track experience, TCS can be dangerous as you generally want more throttle to control the car rather than less. If you ever watch racing on tv, you'll notice that 99.9% of the time drivers give more gas when the car goes into a slide rather than letting off. However, most of the general public doesn't understand, nor do they care, about car control, so TSC is intended to protect them from themselves.
2. Overdrive (OD), it's essentially an extra gear on the transmission. At highway speeds, it reduces the gearing of the car to improve efficiency. A 5-spd OD tranny is a lot like a 6-spd non-OD tranny. If you're cruising down the highway with OD off in 5th gear, you're probably turning more RPM's than necessary which in turn decreases your MPG.
'05 GT - Borla Catback, JLT Series 3 Intake & SCT SF3 Tuner, Koni Adjustable Shocks/Struts, H&R Race Springs, Roush Shifter, Hawk HP+ Brakes all around, Steeda Front Sway Bar & End-Links, Royal Purple Fluids
'2011 F-250 Super Duty Crew Cab - 6.7L PSD 4x4