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Old 10-22-2012, 09:30 AM   #13
Radar Chief Radar Chief is offline
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Quote:
Originally Posted by DJ's left nut View Post
This is wrong.

Manual transmissions don't actually do much (if anything) to save on gas anymore. In fact, very few people are good enough with their shift points to keep them from getting worse MPG. Either they shift too late and run the RPMs up or they shift too early and dog the motor. Either way, they're not as precise as the manual that's been computer engineered to shift at the exact right time depending on your acceleration and power needs.

Manual transmissions tend to be on shitty econoboxes that get good gas mileage, but an automatic tranmission with overdrive will easily get just as good MPG unless the motor is so underpowered that it has to downshift to stay at speed.

With engine technology allowing people to get decent power even from fuel sippers, and with computer adjustable shift points on modern automatics, there is next to no distinction between automatic and manual transmissions in terms of MPG.

That argument for manuals is dead and has been for a decade+.
Sorry but this is just incorrect.
Parasitic Horse Power Loss, everything run by the engine is taking horsepower to make it work.
Plainly put, it takes more horsepower to run an automatic transmission than a manual one.
Take two cars with equal weight, engine, gearing and aerodynamics, the only difference being that one has an automatic and the other has a manual and the manual transmission with get better gas mileage because it’s not spending horsepower to spin fluid pumps or to power shift servos.
This is why “shitty little econo boxes” are still running manuals.

Quote:
Originally Posted by DJ's left nut View Post
As to the brakes arguments - brake pads cost $60 and over the life of your car, if you were to downshift at every single point coming up to every single stop light you might save yourself the cost of one set of brake pads. However, by using engine compression to slow your car as you downshift, you're adding wear to the seals, etc... in your motor and thus making your motor less efficient over time.

Is a manual more fun? Yeah, when you want it to be. The easy compromise situation is an auto-stick transmission paired to a flappy paddle gear shift on your steering wheel. When I want to do nothing but go home, it stays in auto. When I want to run the shit out of it, I knock the knob to the left and shift on the steering wheel.

Done and done.
The brake wear argument is that when you push in the clutch you’re mechanically disconnecting the engine from the rest of the drive line so the engine isn’t still trying to push the vehicle forward while brakes are applied.
I’m sure the extra engine RPM’s could accelerate engine wear but mostly using engine compression for braking just wasteful of gas as you’re spending money in the form of gas to decelerate when the brakes are perfectly capable of doing the same job.
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