New 2007 Silverado 5.3L gas mileage mods!
Sep 16, 2007 | 01:16 PM
#1
Thread Starter
Staging Lane
Joined: Jul 2004
Posts: 82
Likes: 0
From: Northern California
New 2007 Silverado 5.3L gas mileage mods!
What do you guys recommend for gas mileage mods. I use this truck as my daily driver. I love it, but mileage sucks. It's cheaper to drive my zo6!
Sep 16, 2007 | 02:44 PM
#2
Staging Lane
Joined: Jul 2004
Posts: 66
Likes: 0
From: Las Vegas
What worked for me is in my signature... On my last truck, I installed nearly the same modifications, one at a time to see the difference, and each one had a result in more power and better gas mileage. From start to finish, with a 5.3 2wd 3.73 gears, my mileage when up 3 mpg, getting 21 on the freeway doing 65. On my current truck, I gained 2 mpg, then switched from a Hypertech tune to a custom tune; what a difference gained one more mpg and more power. The article in the October issue of Hot Rod is a good example for mods that have the biggest change; headers and a custom tune close to 50 HP.
For headers, if your State will let you, go long tube. Being in California, the only headers that were available were mid-length by "The Other Guys" (which, the last I heard, are out of business). I am a solid fan of using coated headers; make more power and last longer (stainless steel would be my second choice).
For exhausts, I have had good experience with Gibson and Magnaflow single side. Both of these added about .75 - 1 mpg for me (in mixed City and Freeway 45 mile round trip). The key to a good exhaust is having any pipe bends being mandrel bent, not partially crushed; smooth all the way, no reductions in diameter).
For air filter replacement, the idea is to have cold air reach a large filter and have the air be under pressure. This has a slight "supercharging" effect, plus the cooler the air, the more dense it is. The best place is right along where the hood meets the windshield, the next is at the front of the vehicle (and away for the radiator). There are many brands, but I am happy with Airaid.
There are other products on the market which, in my opinion, don't help very much for the money. I had a GMS modified MAF on my last truck and did not notice any difference. There are a few throttle body spacers, and some with spiral air effects; these can be great for carburators to mix the fuel and/or gain a little plenum, but for FI it only adds to the air restriction.
For headers, if your State will let you, go long tube. Being in California, the only headers that were available were mid-length by "The Other Guys" (which, the last I heard, are out of business). I am a solid fan of using coated headers; make more power and last longer (stainless steel would be my second choice).
For exhausts, I have had good experience with Gibson and Magnaflow single side. Both of these added about .75 - 1 mpg for me (in mixed City and Freeway 45 mile round trip). The key to a good exhaust is having any pipe bends being mandrel bent, not partially crushed; smooth all the way, no reductions in diameter).
For air filter replacement, the idea is to have cold air reach a large filter and have the air be under pressure. This has a slight "supercharging" effect, plus the cooler the air, the more dense it is. The best place is right along where the hood meets the windshield, the next is at the front of the vehicle (and away for the radiator). There are many brands, but I am happy with Airaid.
There are other products on the market which, in my opinion, don't help very much for the money. I had a GMS modified MAF on my last truck and did not notice any difference. There are a few throttle body spacers, and some with spiral air effects; these can be great for carburators to mix the fuel and/or gain a little plenum, but for FI it only adds to the air restriction.
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