Fuel additives for better MPG - Castle Products
Better fuel economy than a

Fuel additives for better MPG

Go back to COMG- The Cruze Owner's Maintenance Guide

I wrote this up for another forum I'm on and figured it would be a good basic write-up for this community as well.

How to Get Better Fuel Economy

So I've had my Cruze Eco for about a month and a half now and I've made it a game to see how high of a fuel economy I can get. I drive 75%-90% city driving and manage 36-40mpg on a car rated for 28mpg in-town. I've picked up a few tricks, techniques, and methods along the way which, in light of the expected gas prices this summer, might benefit some of you who want to save a few bucks.

As of the time of writing, I was able to (with my Cruze Eco MT) manage 39.8MPG in my last tank of gas with 80% city driving, and my current tank of gas shows 46.1MPG on the DIC with 170 miles driven at 75% city driving, which is consistently 1.5-2.0mpg too optimistic. I expect 43-44mpg at the next fill-up. Consider that the car is rated for 28mpg city, 42mpg highway. These methods work.


Lets start with the simple stuff; mechanical. The behavioral techniques I'll mention later will be useless if your car has mechanical issues.

A. Tire pressure/Tires. This should be obvious, but some people are too lazy or they just forget. I'm guilty of this. I spent 3 months chasing down a condition in which my car pulled ever so slightly to the right. I only realized when I put snow tires on that one of the tires was low. Facepalm. If you're buying new tires, narrower tires are better than wider tires for fuel economy. Lower rolling resistance, less air drag.

Tire's should be inflated according to the manufacturer suggestion. I say suggestion because its just that; a suggestion. This is a number that is provided for a "best compromise" situation. A lower tire pressure will soften the ride and provide better dry traction, but will cause more heat due to rolling resistance and reduce fuel economy. Too low of a tire pressure can result in catastrophic failure. A higher tire pressure will stiffen the ride and may compromise dry traction, but will improve fuel economy as much as 3-4mpg.

Tires can be safely inflated to their maximum sidewall pressure without any danger of catastrophic failure, as this is set by the manufacturer of the tire. Reports on cleanmpg.com forums indicate that tire life is also greatly extended when tires are inflated beyond the car manufacturer's suggested pressure. Most people who inflate to the sidewall recommended pressure end up replacing their tires due to dry rot well past the tire's warranty mileage, not due to balding, loss of tread depth, or uneven tire wear. It is up to you to determine what the best pressure is for your tires based on the information provided in this section.

B. Mechanical maintenance. This isn't so obvious, but it should be considered. If your fuel economy flat out sucks, something is wrong. Spark plugs/wires and O2 sensors do go bad after a while and need to be replaced. MAF sensors need to be cleaned (CAREFULLY or with a MAF cleaner aerosol can), and a good seafoam wouldn't hurt either. Air and fuel filters are a given. 180 degree thermostats might be nice for performance, but 195 and 215 degree thermostats will get you better fuel economy. If you have a bad wheel bearing or a dragging brake caliper, get it fixed.

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Popular Q&A

What kind of fuel additive should i add to get more mpg?

what is a fuel additive that will increase mpg by at least 25% i'm talking about a v-6 fuel injected gasoline (not diesel) powered motor

Nothing.Additives do more damage to your engine. Want to get better mpg? Maintain your tires air pressure,oil changes and repair anything that needs to be repaired.Also clean out your car of unnecessary weight.

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