Alright, my truck has a 87/89 dual tuned PCM from Allen in it... Normally, I fill up with regularole 87 octane gas, but on my last fill up I decided to get crazy and use 89. Well, after I filled up with 87 tonight, I checked my MPG, and it went up 2 MPG while it had the 89 octane in it! Is that normal, or just a coincidence?
2002 ECSB, Nelson Tune, LS1 electric fans, 145A alternator, K&N FIPK, 160º T-stat, TB coolant bypass, Corvette servo, 4 headlight mod, blue LED gauge cluster
using the higher grade fuel will allow the pcm to run a higher timing value at times. a lot is how it was driven also.
04 supercrew 5.4 3 valve-magnaflow catback
formerly 02denali 12.79@107
I'm averaging 19.5 after the cam install and running the 93 tune. Stock I could barely average 16.5 on a good day! This is driving about a 75 highway/25 city mix.
Chris
2009 Silverado, HPTuners, all stock.
I have the 87/89 tune using 93 octane and got 20 driving through the mountains above 7000 feet. I used to get 17 on a great day before the tune.
kinda depends on how you drive...seems most of us ..when we have more power usually keep our foot in it more often than notOriginally posted by BlenderWizard@Jul 21 2005, 07:33 PM
Alright, my truck has a 87/89 dual tuned PCM from Allen in it and it went up 2 MPG while it had the 89 octane in it! Is that normal, or just a coincidence?
'13 silverado LT...stock
'11 lt 4x4 z71..tvs1900
'01 gmc twins 6.0 jakes 400 ladder bars w/ coilovers tuned by nelson performance
Yeah.....having a heavy foot is kind of common place in Nelson Country....I keep my foot in it and still get better mileage, no complaints here!QUOTE (BlenderWizard @ Jul 21 2005, 07:33 PM)
Alright, my truck has a 87/89 dual tuned PCM from Allen in it and it went up 2 MPG while it had the 89 octane in it! Is that normal, or just a coincidence?
kinda depends on how you drive...seems most of us ..when we have more power usually keep our foot in it more often than not [/b]
Chris
2009 Silverado, HPTuners, all stock.
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