Save Gas! Change the Way You Drive.




Introduction: Save Gas! Change the Way You Drive.

What better way to be eco friendly than to change your gas mileage? Seriously think about it. The less gas you use the less our mother earth has to be drilled, poked, and prodded for that precious black sludge.

Petroleum accounts for 40% of the worlds' energy consumption... OUCH

This instructable will show you various techniques you can use DAILY to reduce your gasoline or diesel consumption.

Contrary to popular belief the aftermarket products that claim to save you gas mileage actually do nothing. Sometimes they can even have a negative effect.

Before we begin I would like to state that I am an automotive technician. I have to test drive vehicles on a daily basis. By implementing these techniques you can improve your gas mileage. Getting reprimanded for consuming too much of a customers gas is not fun! So lets get started.

Step 1: Products to Stay Away From!

Lets start with a few products out there that you should stay away from. I'll stick with the main three.

ALL of these products have been proven to be ineffective.

1. Magnetic Ionic Save. A magnet clipped to the fuel line to reduce CO emissions.
Here at the shop we have a 5 gas analyzer and I had some spare change. I decided to test this product on my down time.
Tests showed that there was no change in CO emissions when this product was installed.
Fuel consumption was measured in ML over a 2 minute period at 2000 RPM. Once again NO CHANGE.

2. Torpedo type intake devices. These devices are simply tin or steel and claim to improve fuel combustion.
I would have personally tested this but on three different occasions we found them jammed in throttle bodies. NOT RECOMMENDED. High dollar fix for a low dollar product.

3. Gas Additives.
JUNK. Even the dealership that I worked at sold this stuff. I would refuse to put it in the tank. Clogs fuel filters and stays at the bottom of the tank.

Step 2: Driving Techniques

Here are some techniques that I have used or still use.

1. Carpooling! The best way to save gas. If your buddy works at the same place at the same time hitch a ride! Maybe it's your turn to drive!
Consumption Reduction = 50%

2. Drafting! This technique is dangerous if you push too close. Drafting is a technique used in racing. It reduces the aerodynamic drag on your car by sitting in a pocket of air behind another vehicle. This technique works best behind semi trucks. You do not have to get very close at all. Just enough for you to barely see the semi's side mirrors.
Consumption Reduction = Varies but is significant

3. Lay off the throttle! Don't show off and bounce off of your rev limiter. This is a HUGE waste of gas. Not to mention how much damage it does to the engine internals.
Consumption Reduction = 20%-25% (YES IT'S TRUE)

4. Lose some weight! Are you carrying around LOADS of unnecessary stuff in your trunk? Time to do some spring cleaning. Get rid of it! This creates a lot less strain on the engine.
Consumption Reduction = Slightly Noticeable

Step 3: Techniques Continued...

5. Don't Idle! I know that remote start comes in handy during 40 degree winters, but your car consumes a lot of gas while it's idling. Don't let it sit in the driveway for twenty minutes to warm up if you're only going down the road to Walgreens for some toilet paper. Also, this tip is great for heavy traffic jams. Plus this drastically reduces CO emissions being release into the atmosphere.

6. Let it Idle! This can be dangerous! Oh yes I did just contradict myself! Stopping and starting a car consumes more gas than it would for you to let it idle for a minute or two. It takes a lot of gas to get it going. If you're just running into the store to pick up gum then let it idle. DO THIS AT YOUR OWN RISK OR IF YOU HAVE A REMOTE START. Using a remote start you can allow your car to idle locked up without the key in the ignition.

7. Keep your car warm! If you have access to a heated garage this can help you in the winter time. Your car consumes more gas under cold start up conditions. You could also buy an engine block heater!
TECH TALK: Your engine needs to be warm for it to be as efficient as possible. Warmth is needed for the O2 sensors to start what is called closed loop operation. This is when your cars computer can begin to adjust air/fuel ratios.

8. Stay in your lane! Studies have shown that lane changing does not significantly reduce your travel time. Simple and easy...

Step 4: More Techniques!!!

9. Don't drive AGGRESSIVELY! Seriously CALM down! Aggressive driving reduces your gas mileage by 33% highway and 5% in town!

10. Cruise! Typically your cruise control can save you gas. I don't know anyone that can drive smoother than a car with the cruise control on. **EDIT** Do not use your cruise on hilly roads.

11. Tune er' up! A proper tune-up will drastically improve your gas mileage as well as maintain a reliable vehicle.

12. Inflation! Proper tire inflation is key to maintaining proper gas mileage. Over-inflated and under-inflated tires have less surface area on the road. This also saves you $400-$500 every year or two on a new set of tires!
Consumption Reduction = 3.5%

Step 5: That's It!

Hope you enjoyed this tutorial!

By implementing all or some of these techniques you will save gas!
Saving gas not only helps your wallet stay fat, but also the environment.

CO2 emissions from U.S. cars & trucks totaled 314 million metric tons in 2002. That's as much as would be released from burning all the coal in a train 50,000 miles long -- enough to circle around the world, twice.

Help out the atmosphere and enjoy yourself while doing it! :)

Thanks for reading!




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    51 Discussions

    I have to lose weight? Not be aggressive when driving? and you want me to not rev the engine!?... Well ok if it helps I will work on my driving to save gas... (sniffle)

    Ps I like the Idea of drafting behind a semi though.

    i just wanted to know if it was actually possible to reuse the co2 after being filtered? for example, you take a compressor with you,a gas filter and a reuseable co2 tank . could you hook up your exaust pipe to your ompressor and refill your co2 tank?

    Step 5 states "your car consumes a lot of gas while it's idling". An automotive tech would know better. Idling consumes a tiny amount of gas. No automotive engineer would ever design an engine to be shut off and turned back on constantly in traffic, even if it was more than 30 seconds. Wear caused by rapid heat cycling can be high. Again, idling consumes very little gas.

    7 replies

    Are you an automotive tech? Have you ever run a fuel volume test? Step 5 is completely true ESPECIALLY when the engine is still running cold. During cold engine startup (exhaust temps under 600 F) the O2 sensors are still in OPEN LOOP. This causes an excess dump of fuel because the ECU/ECM does not know how much fuel to add. It is simply "enough" fuel to start the vehicle. After the O2 sensors achieve CLOSED LOOP then it knows how much fuel to add. Before closed loop the fuel system is working purely off of a fuel map. By the way I am a technician with credentials to prove it.

    Spare me the explainations, I know what open vs. closed loop is, I'm not going to take open loop running into account because no matter what you do, that's what happens at cold start. After the engine has gone into closed loop, does an idleing engine consume a large amount of gas? If it does, cruising under load or accelerating consumes less? Are you an automotive tech? Have you ever been in a Turkish prison? I'm afraid that I will have to see those credentials. I got mine from the bottom of a box of cereal.

    Idleing does consume a lot of gas if you allow it to idle for a while. That's what the point of the idleing statement was. Don't let it run if you're going to leave it a while. Here's my credentials.

    Wow. Thank you for actually posting your credentials. Please don't be offended if I state that I was hardly serious about wanting proof. I can gather that you know a thing or two without photographic evidence. How hard would it be to find an accurate fuel consumption rate on a common car (10 years or less old, 100K miles or less, 4 cylinder) at idle? I would like to see some comparisons to consumption rates at medium throttle and cruise. Of course, now we've gone beyond the scope of a siple suggestion on a DIY website. You are knowledgeable and experienced, and though I disaggree, I concede. I'm taking my toys and going home. Yours too. I'm taking your toys.

    For the sake of being nice I will tell you that most of the vehicles I have worked on were imports (85% roughly). If thats any consolation.

    getting the fuel consumption rate is easy, get a ScanGaugeII. I use one in my 05 jeep liberty to monitor mileage and fuel consumption, when i start my engine while it's still hot the peak consumption during start up in never even double the idle consumption, and that's for only about 2 seconds of the start up, so if you're going to be sitting waiting for a train to pass, you might as well shut off the engine. Like a lot of these instructables say, changing the way you drive will make the biggest difference, according to the EPA testing, my jeep should get 17 mpg in the and 21 on the highway, and most people know those are usually a little on the high side. after changing the way i drive i routinely get 17 mpg in the city (my commute to work, i usually get to work about the time the engine is up to temp) and 24-26 on the highway that's a 14-20%(roughly) increase on the highway.

    Cruise control set @ the speed limit & not driving aggresively are the best for efficiency based on my experience & remember "slower traffic keep right"

    I've tried drafting several times @ 60-65 MPH on a route I drove on for a little over a 6 months before I tried drafting & have to admit drafting does work. I had some1 in the vehicle with me & they say they felt the a difference in the ride comfort between 30 feet & 50 feet.
    I also tried a cold air intake & my rpm @ 65 MPH dropped by 200.
    Because I deduct my gas consumption on my taxes I could tell.
    All this took place over the span of 1 year 3 months.
    I'll even give you the route.
    Light traffic on highway 101 to 80 to 880 total 48 miles round trip.
    Heater was the only thing running in the mornings to defrost the windshield.
    Heavy traffic was a factor only about 10 days out of that whole time.
    I know seems unbelievable if you know the area but thats my story.
    Mileage went from 13 mpg to 16 average just by getting my cold air intake.

    I disagree in two places.

    • Since when does it take more gas to start a car? If it's running properly, it shouldn't take any more gas than an extra couple seconds of idling. On the other hand, most modern cars idle at 1500 rpm, which is way too fast and sucks gas.
    • One place that the cruise control will NOT save you gas is in hilly areas. The cruise does not have the ability to speed up while going downhill and let it slow down while going back up. Drive manually and pretend you're a semi in these areas.

    Other than that, nice job!
    7 replies

    who told you that cars idle at 1500 rpm. a normal automatic usually idles at around 700 rpm and manual at 500 rpm

    like Prometheus said it is only at 1500 for like a couple seconds right when you start it, and I am building truck number 2 from the ground up so I would kinda know where a car would idle.

    I know it sounds off but do youre home work and read up on starting a gas engine. It's just like turning on an electric light or starting an electric motor or starting anything at all. The very most power you will use is at the start. Try pushing a car, the very most effort you will give will be at the START and on a flat ground once the car is rolling it will almost keep going. What this means is, and what is trying to be said is if you run into a store for 2 minutes you will eat less gas than if you shut off your car and strart it back up the same with a light and electric motor. Would you like me to hit the brakes every 2 feet as you push my car into the gas station and you have to get it rolling again?? Try it!!

    Your car will consume more gas on colder starts. This is a proven fact. Even in warm weather initial starts. If the engine is not warm it the CPU is in open loop operation. When it warms up (600+ degrees F) it is in closed loop operation. Closed loop is when your CPU computes air fuel ratios. Open loop is a continuous dump of fuel. A predetermined amount to keep it running.

    As for the cruise control you are right. Hilly areas will not improve gas mileage. That is why I said "typically".