gas mileage

[roymarine]

Sold my 2004 z66 last year when fuel got expensive. Now I'm looking for another z66. I test drove a 2003 today. The truck seems identical, however the mileage is rated lower on the 03. Same engine, same axle ratio ...what gives?

[ygmn]

Do not beleive.... mpg for most part is same until you get to 2007 model year which have the cylinder deactivation feature which gives you abit more on Highway...

[Z66Modder]

You can do mods to improve millage and power, so ignore what propaganda is written. My Z66 gets 19 on the Highway in it's current configuration.

ygmn has a Z66 as well, and I'm sure he gets about the same.