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do you get better fuel mileage in the winter or the summer (HAND CALCULATED)and what is the reason for this .I noticed that my truck does better in the winter 17.3 vs summer 16.5...avg...cooler air maybe .I definitely have more power in the winter .

hello everyone was just wondering if you can change a 2005 lly 5 speed allison into a 6 speed?is it cost efficient ?does it gain more mpg?will ir take more hp and torque!!!LOL Just had to ask.any info would be greatly appreciated.thank you.

I have a 2005 lly 3.73 gears cc 4x4 3500 regency conversion lbz mouthpiece ppe stage 2 amsoil thru and thru,I am getting 17 mpg empty straight down interstate 40,what else could I do to get 20 mpgs??I still have a few months of warranty .love my duramax.17 inch on front and 16 inch on back ??not...

I am some what confused I am going amsoil and do not know what to use, and how much ,in my 05 lly 5 speed allison automatic .I called amsoil tech support and they said to use amsoil universal atf .but could not tell me how much.I just want to change the filter and how much oil there is when you...

this is all new to me I just boughht a lly and love it I am a hunter and love to fish to and also am a rig welder and am currently in ok.49yrs old kinda crazy !and love to get more fuel mileage out of my dmax