What effect does a Plus Torque conversion have on fuel economy?
It rather depends on how it is used. Best economy is achieved from spark ignition engines by running near to full throttle (not at high vacuum according to some popular beliefs) and at moderate engine speed. Hence use of the highest possible gear will generally deliver best economy. Improving responsiveness and mid-range torque makes this more easily achievable in normal driving so can aid highway cruise economy, however use of full available performance will always use a lot of fuel.
