[68c10airstream]

A 2014 silverado has a cam driven ultra high pressure fuel pump (output can reach 2700 psi) and you would have the latest can bus system that i believe is different than prior can bus systems. I can see the costs staying up there for a while, but with this high fuel pressure in the future i feel you will get better mileage. You still need a pump in/near the tank no matter what system you go with. The current generation of 5.3's are 355 horse power, and i believe 10 plus to 1 compresssion. These specs would be equivalent to a 6.0 from early 2000's and you can be quaranteed the mileage is better on the newer 5.3. My mileage comments will probably get shot down with gas at $2.50 a gallon now, but i bet it will be commented on if we get back to $4.00 or more a gallon.