How Can I Get Better Gas Mileage In My 6.4 Hemi?

Does 6.4 Hemi require premium gas?

Well-Known Member.

89 is recommended, 87 is acceptable.

Premium offers no benefit and is suggested not to be used..

Regular unleaded should do just fine.

How much boost can a 6.4 Hemi handle?

Registered. Most people would respond 6 pounds or less. Magnuson advertises 6psi for the 6.4 although the reality is that it is closer to 5.5psi.

Is the 6.4 Hemi a good engine?

In general, the 6.4 Hemi is a big reliable, American pushrod V8 engine with a factory warranty for five years or 100,000 miles. In stock form, the 6.4 Hemi is a great engine that lasts and serves hundreds of thousand miles. But, the stock 6.4 is by design not built for boost and pushing more power.

How long will a 5.7 Hemi last?

5.7 Hemi engines are good for 250-300 000 miles and more if properly cared for and regular maintenance is carried out. Early models suffered from valve seat issues which was rectified after 2008. It’s not uncommon to find high mileage 5.7 Hemi trucks running around today.

What kind of gas does a 6.4 Hemi take?

Premium gas (highest octane) is recommended for the 6.4L SRT engine, whereas midgrade gas is recommended for the 5.7L HEMI and regular gas is recommended for the 3.6L engine.

How much can a Ram 2500 6.4 HEMI tow?

How Much Can a RAM 2500 Tow? With the 6.4L HEMI® V8 engine, this RAM truck has a Best-In-Class max RAM towing capacity of 17,130 pounds and 6,600-pound max payload capacity.

How can I get more horsepower out of my 6.4 Hemi?

Cooler air is denser, carrying additional oxygen, prompting your 6.4 liter Hemi ECU to add more fuel, thus increasing horsepower. The air intake system utilizes a seven-inch, non-woven synthetic filter media to help protect your engine from harmful dirt, dust, and debris.

Do Hemi engines use more gas?

The Hemi design really scores on that last point. Hemi surface area is smaller than that of a flathead engine, so less heat escapes during combustion – and hotter fuel burns better. … Bigger valves means improved air flow through the engine.

How can I make my Hemi more fuel efficient?

Keeping a steady speed maximizes time and mileage. If you can’t due to fluctuations in traffic, lay back and attempt to keep a steady speed as traffic speeds and slows in front of you. 5) Set the air pressure in your tires to the max pressure on the sidewall. Less rolling resistance results in less fuel used.

Does the 6.4 Hemi have cylinder deactivation?

For the ’12 model year, SRT8 versions of the Chrysler 300, Dodge Challenger and Charger and Jeep Grand Cherokee come fitted with a version of the fuel-saver technology that shuts down half the cylinders in their 470-hp 6.4L V-8 Hemi engine more often than earlier renditions of the deactivation system.

Is a 6.4 Hemi a big block?

The modern hemi is definitely a small block. The small block / big block is not determined by the factory displacement (for example, Chevy built a 400 cubic inch small block that had more displacement from the factory than the original 396 big block).

How much HP can a 392 handle?

The crank is forged, so with pistons and rods you should be able to bump it on up to 10-12 psi. This should net you 650+ rwhp with a good tune.

Does Hemi need premium gas?

When the Hemi is matched with an automatic transmission, Chrysler recommends 89 octane fuel for peak performance. 87 octane is the minimum octane rating listed for the base Hemi regardless of transmission, but for the best mileage and performance, the higher-octane recommendations should be followed.

What is the fuel mileage for a 6.4 Hemi?

The 2020 Ram HD 2500 6.4L Gas All of those factors help a little bit with efficiency. Over 1,051.8 total miles, the Ram averaged 15.4 mpg.