yet another mpg ? with specifics
Senior User
Joined: May 2005
Posts: 128
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From: NEWTOWN, ct
basically your pinion gear turns 4.1 times for every revolution per axle...so, the input shaft spins higher than a engine spinning 3.73 gears in order to make the most of your power. rock crawlers favor a higher ratio....4.10 and up this makes the most of your engine power, but essentially your engine needs to rev higher in order to reach the same speed as 3.73's. 3.73's are great for highway mileage, but for pulling power and better stop and go mileage, the 4.10s are probably better. i have the 3.73s and wish i had 4.10s, i tow around town a lot. maybe next time..
Senior User
Joined: May 2005
Posts: 128
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From: NEWTOWN, ct
also, when someone says, only 2-3 mpg.... that equates to almost 15% loss in fuel efficiency. 2-3 ain't bad if you have a honda, but with a truck that gets only about 10-12 2-3 makes a difference. i guarantee that we'll all be putting 3 dollar a gallon gas in our trucks come memorial day. write it on your calender and compliment me on my foresight after it happens....
Postmaster
Joined: Nov 2003
Posts: 3,595
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From: Utah County, UT
Originally Posted by thefnswits
also, when someone says, only 2-3 mpg.... that equates to almost 15% loss in fuel efficiency. 2-3 ain't bad if you have a honda, but with a truck that gets only about 10-12 2-3 makes a difference. i guarantee that we'll all be putting 3 dollar a gallon gas in our trucks come memorial day. write it on your calender and compliment me on my foresight after it happens....
Freshman User
Joined: Dec 2004
Posts: 49
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I am a big believer in the diesel. When I got my 99 CC 350, I put a Diablo 78 hp chip in it. On the highway, keeping the engine below 2000 rpm (i.e. staying about 70ish) gave me close to 19 mpg.
Chipping the truck changed parameters and I believe, gave it better performance and performance.
I am using a generic flip chip 50-75-125 (set on 50), with 315s, a huge front bumper/winch, and a 3.5 leveling kit, K&N filter, and 4" exhaust (plus gauges, yes). I am still getting about 15.5 on the highway. I don't drive like fuel is free, so perhaps that explains part of my mileage. Hauling a 9000# 32' travel trailer in the Hill Country of Texas, I still get about 11-12 mpg.
Chipping the truck changed parameters and I believe, gave it better performance and performance.
I am using a generic flip chip 50-75-125 (set on 50), with 315s, a huge front bumper/winch, and a 3.5 leveling kit, K&N filter, and 4" exhaust (plus gauges, yes). I am still getting about 15.5 on the highway. I don't drive like fuel is free, so perhaps that explains part of my mileage. Hauling a 9000# 32' travel trailer in the Hill Country of Texas, I still get about 11-12 mpg.
