Quote:
Originally Posted by TonyToughNuts
holy crap!! 19-20?? see, use 5-20 like it says on yours (and mine) i get 26 if i'm easy and 21 if i'm tearing around. crap. i get 17 doing 135 mph on I-10 between Ft. Hood and Ft. Bliss! and that is stock minus a CAI and a home P&P TB/plenum.
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Well I thought someone might come up with numbers like that. To be more specific, I get 19-20mpg mostly street, lots of traffic, lots of lights in my area. Highway only time I measured I got 23mpg. Mine is stock with cold air, catback, and offroad H. I only have 2 02 sensors also which would effect my air/fuel ratio. There are a number of variables that factor in, tire size, etc. How many miles do you have and what trans? Due to the overwhelming thoughts on this, next oil change, I think I'm going with the 5W-20 to see if there is any significant difference. I doubt there will be, but we'll just have to wait and see.
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2002 Mustang GT, 271hp/306tq on 87 CMR Tune, Roush short throw rally style shifter, King Cobra Clutch, Roush CAI, C&L Plenum, BBK/Roush 75mm T/B, Kooks L/Ts w/catted X, Bassani Cat-back, Eibach Pro-kit Springs, Energy Suspension bushings, KYB AGX's, Hotchkis C/C plates, UPR ProStreet rear control arms, Brembo Drilled/Hawk pads, BFG's, Dual Halo Projector 8k HIDs, Kenwood: KDC-X790, KAC-9102D, KAC-8402; Infinity: 6810CS, 6812CF; Orion: P series subs all powered by Optima 
My car http://www.cardomain.com/ride/2628572
My truck http://www.cardomain.com/ride/2206751
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