Author Topic: MPG, Part 2  (Read 20790 times)

Offline Irish_Alley

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Re: MPG, Part 2
« Reply #120 on: March 19, 2020, 07:50:34 AM »
be cautious of the AFM on those causing collapsed lifters. from what i understand its not a matter of "if" but "when", its somewhat of a easy fix and you might be able to luck out and prevent it from happening. theres a few youtube vids on it
https://www.youtube.com/watch?v=pP7I5tbXsfw

you can even disable it. that whole thing about dropping to 4 cylinders sounds good but imo isnt practical. also you might notice your battery volts dropping to 12.8 or so and this is normal and GMs attempt to save some millage
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Offline Stewart G Griffin

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Re: MPG, Part 2
« Reply #121 on: March 20, 2020, 09:14:23 PM »
i don't think the LH9 5.3 has any of that "AFM" stuff.   It does have variable valve timing and flex fuel capability.   i need to brush up on my LS knowledge.  i've been very busy lately. 

i hear AFM/Displacement on demand isn't good for the engine long-term.  All these tricks to try to get mpg don't seem to pay off in the long run?    The turbo 4 in the silverado can't tow as well as the 4.3, 5.3 etc.    i will  try to locate the article concerning DOD not being good for the engine long-term.

Diesel seems to work great for towing, but then there's the high-initial cost which may never pay for itself unless you do a ton of driving.

You can't change the laws of physics.......
« Last Edit: March 20, 2020, 09:18:38 PM by Stewart G Griffin »

Offline Stewart G Griffin

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Re: MPG, Part 2
« Reply #122 on: March 28, 2020, 02:36:53 PM »
Still on the colorado

271 miles / 16.25 gallons = 16.68

OH NO.......

$2.599 per GALLOn regular at exxon,  $42.24 to fillup.

Now, i was late one day for work, so i was kind of hammering it and maybe that affected it.  Side note at 75 it still rpms below 2500rpm.

Offline Stewart G Griffin

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Re: MPG, Part 2
« Reply #123 on: April 04, 2020, 06:22:35 PM »
colorado

317.5 /  16.63 gallons =  19.02 mpg

$2.099 per gallon regular at exxon.   $34.91 to fillup

Offline Stewart G Griffin

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Re: MPG, Part 2
« Reply #124 on: May 15, 2020, 06:34:08 PM »
colorado

329.7 miles / 18.067 gallons = 18.24 mpg

$1.859 per gallon regular at exxon,   $33.59 to fillup


i was late one day for work.  i think the colorado is speed limited to  99/100 mph?   i can't confirm this.

i discovered that the 5.3 LS DOES have some top end.

Offline fitz

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Re: MPG, Part 2
« Reply #125 on: May 21, 2020, 08:48:04 AM »
With the long weekend coming up have you considered dropping the 4.3 in the Colorado and checking the mpg's?. Ha ha, how are you enjoying the Colorado so far?