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ShinerBock's avatar
ShinerBock
Explorer
Jan 25, 2018

2019 GM trucks get smarter fuel-saving cylinder deactivation

Interesting bit of tech in the new GM V8s to increase fuel economy. These definitely aren't your traditional V8s with all of the added moving parts and computers needed to operate them. It is al...
Tow Vehicles
mooky_stinks's avatar
mooky_stinks
Explorer
Jan 27, 2018
SoundGuy wrote:
mkirsch wrote:
My 2015 4x4 with 5.3L and 3.08 axle ratio gets slightly better fuel mileage than my old 2003 2WD with 4.8L and 3.42 axle ratio.

Clearly they have made some improvements.


That 3.08 coupled to the newer narrow ratio 6-spd vs a 3.42 coupled to the older wide ratio 4-spd is the improvement, not it's fuel management system. Your 5.3L also isn't working as hard as the 4.8L, especially under heavy load. :p


LOL don't forget the 5.3 has about 75 more HP than the 03 4.8

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