20 mpg Ext Cab 4x4 5.3!

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20 mpg Ext Cab 4x4 5.3! - 1/22/2007 9:49:34 PM    Waboom!!   Posts: 78 Joined: 1/13/2007 Status: offline     Well just posting say (happily) that today I calculated my gas mileage and got 225 miles on 11.25 gallon of regular gas. After owning my Silverado 1500 Z71  X cab 4x4 for a few months I always got 13 14 15 mpg average.  And I am not really a lead foot. I checked it 4 tanks in a row with consistant results. Then I ran 2 tanks in a row of super fuel injector cleaner and changed the oil over to Amsoil 5w- 30 , Changed the transmission over to Amsoil Universal Sythetic ATF and switched the rear end to Amsoil Severe gear 75w 90. Not hauling I am now getting 20 mpg. I am immpressed!  _____________________________ 03' Silverado Z71 '03 Acura TL 3.2 Vtec '00 Honda Accord 2.3 5 spd Vtec + couple of cars to crash in demo derbys Post #: 1

RE: 20 mpg Ext Cab 4x4 5.3! - 1/23/2007 12:59:18 AM    engine2 Posts: 1707 Joined: 12/24/2006 Status: offline That is impressive.  I have always heard good things about Amsoil. Did you use a programmer as well? (in reply to Waboom!!) Post #: 2

RE: 20 mpg Ext Cab 4x4 5.3! - 1/23/2007 6:47:23 PM    Waboom!!   Posts: 78 Joined: 1/13/2007 Status: offline No pragramming it is  Bare bones stock. I have 3.73's in back and Hwy tread tires the truck has 40,000 miles on it.  (in reply to engine2) Post #: 3

RE: 20 mpg Ext Cab 4x4 5.3! - 1/23/2007 8:50:35 PM    red69   Posts: 10 Joined: 12/3/2006 Status: offline I get 19-20 in my 05' Z71 after I switched to Mobil 1. (in reply to Waboom!!) Post #: 4

RE: 20 mpg Ext Cab 4x4 5.3! - 1/23/2007 10:14:56 PM    Rod Man   Posts: 14 Joined: 5/26/2006 Status: offline How does changing to sythetic motor oils and diff oils help gas milage? i may want to do this give me some more info please, which motor oil and weight, and same for diff. how many miles do you go on sythetic oil before changing ? Thanks, Rodney (in reply to red69) Post #: 5

RE: 20 mpg Ext Cab 4x4 5.3! - 1/23/2007 10:48:32 PM    Waboom!!   Posts: 78 Joined: 1/13/2007 Status: offline     Very easy... less friction in the driveline. and not as thick during warmup. basically the motor and trans will run with the same ease when cold as they would when nice and warm, ya dig? But also,  I do strongly recommend Amsoil not:  wally world mobil one. < Message edited by Waboom!! -- 1/23/2007 10:52:59 PM > (in reply to Rod Man) Post #: 6

RE: 20 mpg Ext Cab 4x4 5.3! - 1/23/2007 11:01:25 PM    Rod Man   Posts: 14 Joined: 5/26/2006 Status: offline thanks, for the info. i dig it man, lol btw how many miles between changes ? what weight gear oil. front ? and rear ? (in reply to Waboom!!) Post #: 7

RE: 20 mpg Ext Cab 4x4 5.3! - 1/24/2007 7:12:04 PM    Waboom!!   Posts: 78 Joined: 1/13/2007 Status: offline I used Amsoil Severe Gear 75 W 90 in the rearend with NO friction modifier because mine is the G80 auto locking rear differential and your not supposed to add anything per owners manual. other wise I think a guy might need the limited slip additive from GM for the standard differential. As for the front axle its still conventional oil since I dont use  4WD all the time maybe 10 or 12 times a year. (in reply to Rod Man) Post #: 8

RE: 20 mpg Ext Cab 4x4 5.3! - 1/24/2007 9:03:22 PM    red69   Posts: 10 Joined: 12/3/2006 Status: offline   Mobil 1 is factory fill in Corvettes and Vipers and will do just fine in your Chevy truck.  I use 5w-30 in my Z71 and change at 10,000 miles.  (in reply to Waboom!!) Post #: 9

RE: 20 mpg Ext Cab 4x4 5.3! - 1/24/2007 9:29:06 PM    Waboom!!   Posts: 78 Joined: 1/13/2007 Status: offline quote: ORIGINAL: Rod Man btw how many miles between changes ? rod man:This might sound crazy... but I change my Amsoil every 12 to 14,000 miles. Look into it,  Amsoil is the way! check out performanceoiltechnology.com < Message edited by Waboom!! -- 1/24/2007 9:32:18 PM > (in reply to Rod Man) Post #: 10

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