trucks especially are designed for low rpm power and torque. i would suspect a cam,intake and exhaust modification would take care of this. possibly a set of heads,too.
lower rpms use less gas higher rpms have more power
IF they used the same motor and transmission, the truck with 3.55s would turn higher RPMs at speed, but would be better suited for hills. A truck with 3.55s typically will turn 1500 RPMs at 70 MPH. The truck with 3.08s would turn a lot less RPMs at speed. However, it's extremely unlikely the truck with 3.08s will have the same transmission - it would be geared much too high. It probably has a lower geared transmission than what the truck with 3.55s is using.
If it's cold outside, it's because ECU use ambient temperature sensor and coolant sensor to manage RPMs. After you start the car the coolant temperature is low and ECU sets RPMs very high, when it gets warm RPMs drop down until engine reaches operating temperature.
after releasing the clutch and taking off the banshee will go from mid range to high range rpms that's the power band kicking in. when the power band kicks in it will take off like a rocket. after you hit the power band you have about a second or so to shift. after pulling the clutch in and lifting up on the foot shifter it will go from low rpms to high rpms again and so on and so forth
major vacuum leak?
No. the electric super charger does not spin fast enough to push the amount of air an engine needs at high RPMs. At low RPMs the charger may help but will hurt more than help at high RPMs. it does work for the lower rpms just like a supercharger evn if you can produce 4lbs and it will lose power and higher rpms just like a regular rotary style blower its designed for thos lower rpms. they work great for musle cars because the have the low end torque to move the pulley but at higher rpm it loses boost steadly same with the electric supercharger.
no
try adjusting the air intake when throttled up... provided carb is clean
To improve fuel economy- allows engine to operate at lower rpms after speed has been established Overdrive= low power, High speed
did they want freedom
Obviously depends on RPMs. Normally 15-20psi at idle. Could be as high as 30-40psi when the engine is under high RPMs.
High - - - - - - - The outmost reaches of the universe.