CASZ71 Posted February 13, 2010 Author Report Share Posted February 13, 2010 k&n cold air, throttle body spacer, flowmaster high-flow cats, cat back system with 3" pipe to a 4"x18"long tip out back right corner with flowmaster super 44 muff. I may do some other stuff but this is what i plan for this summerBills The super 44's sound great.. Had em on my last truck and loved em Quote 2000 GMC sierra 1500 ext cab KMC XD Spy series rims Front doors Fosgate punch 6 1/2's stock tweets Rear doors Fosgate power 4x6's Probox 10 and box under rear seat Rockford fosgate R-500 Prime series amp (537 rms) 4 gauge wiring Link to comment Share on other sites More sharing options...
CASZ71 Posted February 13, 2010 Author Report Share Posted February 13, 2010 Throttle body spacers are useless unless its a carbureted engine. So those 3mpgs youre seeing extra is from the CAI. I got 2 better with only the tbs and do you have some info to support this?? I'm not sayin that ur bs'in tho.. If it don't help I won't waste money on it.. Quote 2000 GMC sierra 1500 ext cab KMC XD Spy series rims Front doors Fosgate punch 6 1/2's stock tweets Rear doors Fosgate power 4x6's Probox 10 and box under rear seat Rockford fosgate R-500 Prime series amp (537 rms) 4 gauge wiring Link to comment Share on other sites More sharing options...
RichyMitch925 Posted February 13, 2010 Report Share Posted February 13, 2010 Throttle body spacers are useless unless its a carbureted engine. So those 3mpgs youre seeing extra is from the CAI. They arent useless, but they make an annoying noise, id rather hear a bird call then a fuckin whistle Quote Owwwwwwwwww Link to comment Share on other sites More sharing options...
Loudcav Posted February 13, 2010 Report Share Posted February 13, 2010 its all in the distance that you drive I drive like 3 miles to work in anything I use I get shit mileage Quote Link to comment Share on other sites More sharing options...
Wastehog Posted February 21, 2010 Report Share Posted February 21, 2010 (edited) I would suspect the winter blend gasoline, isn't helping much. I know a guy who had an early model hybrid gas/electric car. Summer he pulled 40 miles to a gallon. Winter time he only got 30ish mpg depending. If you were gonna do an upgrade, I would do a freer flowing exhaust and CAI. Ditch the throttle body spacers, the gain isn't worth it. Just my opinion. All they do is give you an extra cfm of air volume. A motor is a big air pump, the freer the air is and colder, the better it runs. If I Got that in my truck I'd be happy =) Granted my foot is usually in it, and it's carbed. Its not stock either, but for a 350 crate motor with restrictive exhaust and not having a cold air intake, I manage 8 with my foot in it, and 12 with it out, city miles.. Stop and go kills me EDIT: I would check you air filter. I'd make sure it's clean. Also, check your throttle body and see if its dirty, any kind of dirt in a fuel injection system messes it up. Edited February 21, 2010 by Wastehog Quote 1985 Chevy Silverado Black and Silver SBC 350/700r4 Link to comment Share on other sites More sharing options...
BURRITO Posted February 22, 2010 Report Share Posted February 22, 2010 it also depends on how the engine was broke in when it was brand new! Quote Barretto MotorsportsTeam RFCTeam CHMTeam SMD "Blow Sand"Live Your Life Without Boundaries... http://www.jeffbarretto.acnrep.com/d_oppor...A=US_EN&BW= Link to comment Share on other sites More sharing options...
Loudcav Posted February 25, 2010 Report Share Posted February 25, 2010 Try to find someone local to you with HP Tuners or EFI live so they can do a scan. I have a mail order tune for the 6.0 trucks that pick up mileage 2-3 miles per gallon. Too bad you are so far away or I would say lets give it a shot on your truck. Damn I didnt realize that you guys were that close to me I pass the shop every time I go to TSC never put 2 and 2 together Quote Link to comment Share on other sites More sharing options...
coyotechromez Posted March 19, 2010 Report Share Posted March 19, 2010 I've got an 04 Silverado 1500 Crew cab 4x4, I get 16mpg hwy and city. K&N cold air intake, synthetic oil, dual exhaust, and I use AMS-Oil Proformance Improver every 10,000 miles $12. If I pull a trailer in 4 wheel drive she drops to 8 mpg, just pulling the trailer bout 12mpg Quote Link to comment Share on other sites More sharing options...
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