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Discussion Starter #1
I know an aluminum underdrive crank pulley will be lighter weight then stock, 1.3 lb vs 3.6 lb and the smaller size will help reduce accessory drag.

I know this will not only free up some hp but also give you mpg gains as well.

Given that at 50 mph I get about 50 mpg would you guess are we talking a miniscule mpg increase of 0.5 - 1.0 mpg or something more around 1.5 - 2.5 mpg gained?

Here is the part...
5 ribs - Ecotec Underdrive Crank Pulley - 2.0LNF/2.2/2.4: by Make and Model - Chevrolet - Cobalt - NA Ecotec UDP - Car Performance Parts And Auto Accessories | MRZ Performance

I know I'm talking several years before breaking even but was just curious.
 

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Discussion Starter #3
Unless I have an unfortunate accident with my balt I'm more inclined to replace the engine if it dies then simply dispose of the car and buy a new one when it hits 150k miles.

That possibly being the case I would end up driving this car for a great many years and it probably would pay off.

I'm also a little obsessed with efficiency.
 
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