which gas helps to improve gas mileage in a car?
828324
Nitrogen when filled in tires helps improve gas mileage.
638011
Most would settle to the bottom of the tank and join all the rust that's already there. Carbon and Potassium Nitrate aren't soluble enough in gasoline (and neither is the graphite form of carbon used to polish the granules in commercial gunpower).\n\nHowever, the sulfur would partially dissolve and eventually ruin the car's catalytic converter. It might even lead to a bit of a smelly exhaust for a while.\n\nNow, if you didn't mean gunpowder, but mean nitrocellulose (which is a more common propellant in modern guns), then you could give him a nice octane boost. However, it takes several days to a week for nitrocellulose to dissolve in gasoline (depending on temperature and 'shaking'). So, don't expect much very soon.\n\nI think the thing you are missing here is that gasoline isn't burned in the tank. Only a small, filtered amount is burned in the engine at one time. That's why you get miles per gallon and not gallons per mile.
1054707
gasoline (you may call it 'petrol')
594660
Save them.  I have actually used about 200 to get a gallon of gas before.  Of course, that was ages ago : )
374376
To Prove to the Right People that My Compact, Safe, Low Pressure Unit can Turn Regular Pump Gasoline into Propane. I've already Accomplished it. The Problem is the Fact that all Vehicles from 1996 to the Present are Required by the Stringent EPA  OBD II Law to Run at 14.7 Parts of Air to 1 Part of Fuel, or the vehicle will Fail Inspection . Even if Fuel Economy is Markedly Improved, and Emissions Lowered, the Vehicle will fail Inspection because by Law, there is a maximum, and a Minimum Limit. Deviate from Either Parameter and the Vehicle will Fail Inspection. This is Insane! I've been to the US Patent Office and Looked at the Patents for Other Similar Units that have been kept off the Market.The Pogue Carburetor, which is Patented, is Documented to Provide 100 + MPG with a Flat-Head Ford V-8 Engine, that's usually 15 MPG, or Less! We have got to Reduce Dependence on Petroleum Worldwide, Vehicle Emissions, and Global Warming. That's the Dream , and the "Why". So, How am I Doing? 14.7 to 1 is the Law. I've Managed to prove 100 to 1 is Possible, but it's a Losing Proposition at this Point. For even More,http://energy21.freeservers.com/bookrep.html Hybird Vehicles aren't the Answer.At Highway Speed, the Gas Engine takes Over, plus the Heavy Batteries have to be Hauled.Cheap, Safe Hydrogen is the Answer, but as long as there is a High level of Profit in Petroleum, nothing will Change, including the insane EPA OBD II Law.So, I'm not doing very well at this Point. Maybe with the Power of the Internet that will Change.
1170819
Nitrous oxide would be good to create a reaction to consume the gasoline, but the definition of combusion is that oxygen is required.
162153
You can get a new exhaust system, cold air intake, you can put in some fuel additives, you can also buy a programmer to reprogram your factory computer.  Just google your car and whatever addition you want to find a good retailer.
136173
In stock car racing, we've been using 110 octane leaded fuel. Our guys have been buying it in 55 gallon drums for  $248.50, or about $4.50 a gallon, plus shipping to the track. \n\nNASCAR is now moving to an unleaded racing fuel.\n\nDepending on the track, NASCAR stock cars get between 4 and 6 mpg. Yeah, not great, I know. Still, we do have (as one friend put it) an interesting way of turning money into noise.\n\nThe impact racing has on the rest of the world's gas/oil is quite minimal in relation to the needs of the many, it's just higher-profile.
390885
i try to consolidate my errands, and i don't accelerate quickly anymore- it burns up to 1/3 more gas every hundred miles. on a job related level, i'm a server in a restaurant and i can definitely tell you where other people are cutting back!! tips are way below average.
206161
some,  but will mainly improve mileage, performance coil will improve power if used with compatable ignition components, otherwise stay stock
231845
Car manufacturers were forced to switch to fuel injection do to government regulations on emissions. Regulations which do more harm than good I might add. Fuel injection is good for most vehicles, but INEXPENSIVE sports cars would be better off with carbs.
56608
gas is also a better recovery time
351187
That 'Hard Luck' knows NOTHIN about cars!  By adding more air to your engine, your air-fuel mixture improves resulting in less fuel required to get the same if not better effect.  So, you get better fuel economy and possibly up to 10 extra ponies squeezed under the hood.  I have witnessed this first hand with our Honda fourwheeler after installing a K&N air filter and a custom Glass pack exaust. It sounds fricken AWESOME!
243296
As with any vehicle Clean Air filter Good gas be easy on the gas peddle properly inflated tires, A good tune up.
232819
You can't go wrong with a high flow exhaust and a high flow air filter, it helps the engine breathe a lot better and should also increase economy.  It might be a bit louder though...
1030651
these increase fuel consumption for 2 reasons .using a/c increases fuel consumption due to power being used to power the a/c's compressor. this is a pump to circulate refrigerant gas around the system. open windows increase fuel consumption due to increased wind ressitance /drag of the car when windows are open.
55682
Turbo charging does affect gas mileage. Typically not as much as supercharging which draws power directly from the engine. However, both will reduce fuel economy slightly since you never get something for nothing in life. The gain with a super or turbo charger is of course is more power because as the prior post points out you're adding more air so you can mix more fuel to get more power.