chromebumpers said:
mathd said:
get a better axle ratio if not already, get it tuned for economy(efilive?), use narrow tire, bed cover, EGR block/delete mod(this one said to help mpg alot).
Avoid using it as grocery getter.
The Allison does have overdrive, wouldn't a lower gear (now has a 3:73) just matter for highway driving? besides, wouldn't that be expensive because i would have to change both front and rear together? I'm not sure that's a job I can do by myself. I like a quite ride so I went with a strickly highway tread Michelin - I might add they have 20K on them and still look like new. I up one size on the tire change - going from a 245 to a 265 to allow flatter cornering. I do have a bed cover. Can you tell me more about the EGR Block/delete mod?
Yeah i forgot all duramax come with 3.73, wich is good you dont want numerically lower for a truck.
said this because some older 6.5 with 4.10 ratio killed the mph on highway, and 3.73 helped them for 2-3 mph.
wider tire lower mph, try to keep them well inflated, stock size will help mpg.
EGRDelete/block, the best option is a EGR disable done wiht programming, EGR delete is alot of work, EGR block, the EGR motor end up blowing wich throw a code and you have to add fingerstick to eliminate the code. EGR disable is best, also i read US vehicule onthe road need EGR to be on the legal side.
EGR delete vs egr block vs egr disable.
http://www.kennedydiesel.com/docs/Duram ... Delete.pdf
Also, kennedy diesel
http://www.kennedydiesel.com/
and health diesel
http://heathdiesel.com/
Are good places for tunes, upgraded parts and stuff like that.
This forum(Dieselplace.com)
http://www.dieselplace.com/
Will be able to help you alot more then i can(they are really willing to help, just make sure to search the forum before asking questions because duramax mpg has been discussed alot on this forum so the answer may already be there).
Am alot more into the old 6.5 turbo, can't really help with duramax.