Compression Ignition Addict
Join Date: Jan 2013
Location: Rancho C. CA
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The poor MPGs are caused by your rear (3.73 ratio) . Being lifted makes it a little worse.
3.73s are the best rears when driving empty, esp. at higher speeds or towing lightly.
You might ask up to what ?
IDK. You have to play with it to find out.
Now when you look at your truck's rated capacities, that dosnt mean........ you cant max it, but dosnt mean you will get decent mpg either.
3.73 gears is your ratio on 4th (the speed your TC locks). Under load & stress your tranny downshifts........so now you are on 3rd with a ratio of 5.70 or so and if that is inadequate for the load, it will throw it on 2nd with a ratio of 8.some witch is alot higher than.........say 4.30 ratio on my 450.
That results in your engine reving up & dumping fuel thus giving you those kind of MPGs.
Title on hand like always