wow, I am shocked to read of these types of problems. Should have figgured that GM might design a vehicle that needs to have the engine pulled to replace a simple starter. I have to agree. 2 mpg is not enough to justify the added complexity. I should think that you ought to get at leasst 3 mpg improvement to cost justify the investment in money and frustration. Sounds like the Silverado system is not yet ready for prime time.