No!
Helps improve fuel mileage.
yes, but they require that you only run Premium fuel. The savings on mileage is offset by the extra cost of the fuel, and its not worth it.
If you have not done so, replace the plugs, plug wires, air filter, and fuel filter. Also replace all under hood vacuum lines.
If you are referring to E85, from my experience using E85 actually lowers the fuel economy.
Keeping up with scheduled maintenance, better driving habits... a lot's been done since ACERT went into effect in the early 2000s which has impaired fuel mileage... EGRs decreased fuel mileage, SCR/DPF/DEF decreases fuel mileage, 2007 introduced Ultra Low Sulphur Diesel - which is a less efficient fuel than the previous low sulphur diese - all in the name of emissions. Turbocharging remains the best option to improve diesel efficiency.
Install a hydrogen fuel cell. Google fuel cell llc. I noticed their first cell produce is for the N14
A Chevy Avalanche uses standard 87 octane fuel. Higher grade fuel will not result in improve mileage or performance.
no, they just mean that the engine has a supply of hydrogen to run on rather than any other fuel
High performance exhausts can have a small, yet statistically insignificant, impact on fuel efficiency. They tend to be installed for a differenct exhaust sound or improved power, not improved fuel mileage.
programer. there are many out there that offer power and fuel economy. banks and superchips are just a couple
Fuel additives are used to improve an automobile's environmental performance and increase its mileage. Some homemade fuel additives are ethanol and a mixture of acetone, xylene and cycle oil.
You can try a fuel catalyst. If you google, "how to improve gas mileage" you'll find a bunch of suggestions. I'm trying a product called Fuel Infusion (http://www.fuelinfusion.com) right now and seeing between 10-15% better mileage. There's lots of things to try, but this might be a good product to test.