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Matt Man · 10-11-2018, 06:38 PM

My 06 rcsb had the 4.3/Auto and when it had the 17" steel wheels it got 17mpg. The truck was lowered 5/7 K&N cold air intake and magnaflow cat back exhaust. I would get the 5.3 like you mentioned.

Here is a picture:

10-11-2018, 06:38 PM	#4
Matt Man Registered User Join Date: Oct 2009 Location: Buhl, Idaho Posts: 1,438	Re: How to optimize a RCSB for gas mileage My 06 rcsb had the 4.3/Auto and when it had the 17" steel wheels it got 17mpg. The truck was lowered 5/7 K&N cold air intake and magnaflow cat back exhaust. I would get the 5.3 like you mentioned. Here is a picture: __________________ 86 c30 crew cab dually 454/400 4/6 drop SOLD 1-8-11 1981 chevy K10 short Bed Scottsdale SOLD 10-26-2020 67 GMC Stepside Straight six/3 on the tree "The Peach" 2020 Silverado Double Cab LT Z71 5.3 8 speed Daily Driver K10 build http://67-72chevytrucks.com/vboard/s...d.php?t=671934 The Peach build http://67-72chevytrucks.com/vboard/s...d.php?t=733903 Last edited by Matt Man; 03-18-2020 at 09:31 PM.