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  1. #1

    Default How To Increase Your MPG?

    Well, I've seen a lot of people asking this question, and I would like to share a few findings I've found. And maybe people can share their findings. I've done the following to my truck to attempt to get better fuel mileage.

    Cold Air Intake, Throttle Body Spacer, New Spark Plugs, New Spark Plug Wires, Dual Exhaust, Fuel Filter, Synthetic Oils, and getting my EVAP Valve and compressor cleaned.

    I've noticed a huge increase in my gas mileage! But it all went to crap when i put bigger tires on. I've also found a few other reasons how to increase your gas mileage.

    Drive Smart

    Aggressive driving (speeding, rapid acceleration and braking) wastes gas. It can lower your gas mileage by 33 percent at highway speeds and by 5 percent around town. Sensible driving is also safer for you and others, so you may save more than gas money

    Fuel Economy Benefit: 5-33%

    Observe the Speed Limit

    While each vehicle reaches its optimal fuel economy at a different speed (or range of speeds), gas mileage usually decreases rapidly at speeds above 60 mph. You can assume that each 5 mph you drive over 60 mph is like paying an additional $0.24 per gallon for gas. Observing the speed limit is also safer.

    Fuel Economy Benefit: 7-23%

    Remove Excess Weight

    Avoid keeping unnecessary items in your vehicle, especially heavy ones. An extra 100 pounds in your vehicle could reduce your MPG by up to 2 percent. The reduction is based on the percentage of extra weight relative to the vehicle's weight and affects smaller vehicles more than larger ones.

    Fuel Economy Benefit: 1-2%/100 lbs

    Avoid Excessive Idling

    Idling gets 0 miles per gallon.

    Use Cruise Control

    Using cruise control on the highway helps you maintain a constant speed and, in most cases, will save gas. That's only if you are driving on mostly flat roads. If you are driving in hilly terrain, using cruise control typically causes your vehicle to speed up faster (to maintain the preset speed) than it would if you were operating the accelerator yourself. Before you push that cruise control button, think about the terrain ahead.

    Engine Maintenance

    Use synthetic oil in your car to save on average 5% gas. Extending oil change intervals can be harmful to the life of your engine and the fuel saving benefits are lost as oil gets dirty. If you cant use synthetic, choose the lightest oil possible, 15-30 rather than 20-50.
    Quote Originally Posted by 1st Synthetics View Post
    Use AMSOIL 100% synthetic lubricant front to back and that alone will pick up you MPG 5% to 10%. My brothers neighbor gained 2 MPG in her 2008 Silverado with a 5.3L. And that was just changing the engine oil & filter to AMSOIL ASL 5W-30.


    Keeping your car washed and waxed improves aerodynamics and therefore affects fuel economy. Engineer Tom Wagner, Jr. reported to (as in stretching your dollars) a 7-percent improvement in fuel economy, from 15 to 16 mpg, during a 1,600-mile road trip.


    Running your air conditioner does cause your vehicle to consume more fuel, but driving with your windows rolled down can be even worse due to the increase of drag on the vehicle. If you are driving slowly, such as around town or in city traffic, then you are better off leaving your windows open, if at all possible. For highway driving, roll up the windows and turn the air conditioning on. The SAE found that most vehicles were more efficient with windows down until a cruising speed of about 65 mph.


    Keeping your tires inflated to a proper air pressure, when your tires aren't inflated to the proper pressure they're less “round” and require more energy to begin moving and to maintain speed. An informal study by students at Carnegie Mellon University found that the majority of cars on U.S. roads are operating on tires inflated to only 80 percent of capacity. According to their findings inflating tires to their proper pressure can improve mileage by about 3.3 percent, whereas leaving them under-inflated can lower mileage by 0.4 percent for every one PSI drop in pressure of all four tires.


    There's many things you can do for your engine that will help with getting better MPG, one of the most popular is purchasing a Cold Air Intake, this allow your engine to take in more air, that's at a colder temperature to have the optimum fuel air mixture, thus increasing your MPG. Also, getting a high output exhaust will increase your MPG, less resistance for your engine to push the air out. From personal experience, some may say otherwise, getting a throttle body spacer, made a SLIGHT(you wouldn't notice if you weren't looking for the benefits) difference in my fuel economy for the better. Also from personal experience I've noticed getting new spark plugs, increases the ease of starting my engine, and gives a light increase in fuel economy, it does this by having a larger spark at the peak of your power stroke, giving better combustion, giving more power per combustion, and you know the rest, burns more of your fuel, that would have otherwise been put out of your exhaust.


    Fuel may contribute to fuel economy, make sure to experiment at different gas stations. Some gas stations may get fuel from the bottom of the barrel, low quality gasoline. Some gas may seem to burn more efficiently in your engine. Be sure to experiment!

    These are ways I've found out, or ways I've been told how to increase your fuel mileage. Share yours please.
    Last edited by ippielb; 07-14-2009 at 04:55 PM.
    2002 Chevrolet Silverado 1500 z71 1985 Chevrolet Silverado k10 2006 Chevrolet Silverado 2500hd 6.6l LLY Duramax
    6.5" BDS Suspension Lift Edelbrock Carb & Polished Intake Manifold & Valve Covers NAPC Race Transmission & NAPC Built Transfer Case
    EFI Live Comp Cam and Valvetrain Snow Performance Methanol Injection
    35" Toyo Open Country Mud Terrain on 18" Ion Alloy 179's Headman Long Tube Headers and True Dual Exhaust FASS 150gph Titanium Series Pump
    AirAid Cold Air Intake with K&N Dry Filter & AirAid PowerAid Throttle Body Spacer 2" Suspension Lift 33x12.50r15 Tires EFI Live & AFE Stage 2 Intake
    Pacesetter Long Tube Headers with Cats Gone True Dual Exhaust FlowPro 3.73 Gears Yukon Grizzly Locker with Mag-Hytec Cover & Traction Bars
    NGK Iridium Tips & MSD Ignition Plug Wires Baja Spare Tire Holder 33x13.5 Hankook rt03 18" XD Rims
    Innovate LC-1 Wideband o2 Sensor x2 HID's all around LED taillights and 3rd brake light
    BDS Dual Steering Stabilizers Pioneer Double-DIN Touchscreen Navigation with Two 10" Subs under rear seat
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    4.56 Gears Airlift Air Bag Suspension

  2. #2
    Sr. Apprentice
    Join Date
    Jun 2009
    Bausman, PA


    You forgot one of the simplest ways. Keep yopur tires inflated to the proper pressure. Low air pressure kills MPG.

  3. #3
    Sr. Mechanic larryleeUSN's Avatar
    Join Date
    Jun 2009
    Now stationed in Mayport,Florida


    this is good. im sure this will help alot of people. im guilty of a few of these. aggressive driving somewhat. but its bc i lvoe to hear the truck i really cant help it. and driving with the windows down( but thats bc the window tint is deff illeagal)
    Lawrence Lee,United States Navy, Engineering.
    2008 Silverado CC. Z71 4x4. leveling kit on with exhaust hopefully putting on soon

  4. #4


    Some things to think about!!!!!
    The diference between stupidity and genius is that genius has limits.

    2007 NBS Silverado
    LT2 Z71
    2.5" Levelling Kit
    Hood Stripes
    Chrome Grill
    GM Bed Liner & Tonno
    Dick Cepek Rims 18X9
    Hankook RF10 Tires 275/65/18
    De-Badged Tailgate

    More Mods Coming

  5. #5

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


    Mythbusters did one on the a/c open window thing, i dont remember there findings but I am sure someone with some downtime today can find it
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual

  6. #6


    Added things you guys posted.

  7. #7


    Ya I remember that mythbusters episode. I believe their findings were that unless you're at highway speeds, it is just about the same between the two. But at highway speeds its definitely better to run AC for obvious reasons.

    2004 Silverado 2500 "Judas"
    Crew Cab and Short Bed
    6.0L Vortec
    Diablo Predator
    True Dual Exhaust: Hooker MaxFlow Mufflers and X-Pipe
    Drop-In K&N Air Filter
    Alpine Stereo System: iDA-x303 Deck, SPS-600 Front and Rear Speakers, KTP-445 Amplifier

    Future Upgrades Include:
    Cosmetic/Other: Spray-In Bed Liner, HID head lights, Leveling Kit
    Performance: Underdrive Pulleys

  8. #8
    Former Member
    Join Date
    Jul 2009
    Grand Rapids, Michigan


    Quote Originally Posted by kjb13 View Post
    You forgot one of the simplest ways. Keep yopur tires inflated to the proper pressure. Low air pressure kills MPG.

    he did retard

  9. #9


    Quote Originally Posted by kylegillean View Post
    he did retard
    Woah there, i added it after he commented on it, i totally forgot about it.

  10. #10
    Legend 2ToNe04's Avatar
    Join Date
    Apr 2009
    Fresno California
    Blog Entries


    nice write up

    you should include intake and exhaust.

    2004 4.8| Custom Paint| Tint| De-badged| Shaved Tailgate| Rollpan| Smoked Tails| Color Matched| Lowered 5/8| Suede Interior| Color Matched Interior| Indash & TVs| Mids-Lows & 2 12" CVRs| 500 & 1100 Interfires| Soundeadener| Outlaw CAI| Magnaflow|
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