Blog Post View

Auto-Rx Plus & Gas Mileage

It is never too early to start with Auto-Rx®. Larry L., a good friend in Southern California, put forth some testing data on running Auto-Rx® on a low-mileage, yet fairly old model Honda Civic. I think the points to note are:

  • The mileage gains derived by following the Auto-Rx® application recommendations.
  • The mileage gain is more than paying for the addition of Auto-Rx® product.
  • The emissions data would indicate more efficient combustion lowering emissions in this unit.
  • Getting a nice even compression performance across all four cylinders that will likely lead to a strong motor for years to come.

Currently this car is using 9 gallons less of fuel with each 5000-mile OCI [oil change interval] from its starting point. In his domain, that is $35 to $40 worth of fuel. His cost of continued use of the maintenance dose of Auto-Rx® is just less than $5.50.

For more info on how Auto-Rx® has helped 10,000-mile motors break in for maximum performance, look at the independent test of the Harley-Davidson motorcycle V-Twin. That test should open your eyes.

Summary of Test Results

Vehicle 1999 Honda Civic – Automatic Transmission

  • 1.6 liters
  • Mileage at start 10,101
  • Engine oil 5w-30 Valvoline conventional oil
  • Oil filter NAPA Gold
  • Gasoline Chevron regular, same station same pump for complete evaluation
  • Mileage over 1,202 miles with no additives, same driver, same commute to work 27.1 mpg.

Note: This mileage reflects driving conditions and driving style and does not reflect ultimate mileage. On fill, the nozzle was removed when it clicked off, no topping off. This method of filling, same station, same pump, and off-on-click was used on every vehicle. This vehicle was moved from weekend driver to daily driver when gas prices went up.

Smog test done in training mode by a facility certified for smog testing only by a tech licensed to perform such tests and teach classes for certification.

Complete service was done by licensed independent Honda mechanic before testing.

All fluids and filters were changed, cooling system was flushed.

One bottle of Auto-Rx® was poured into an engine and it was taken on 30-mile trip.

First number is low speed; second number is high speed, example 12.1/13.2. This is standard practice for a smog test required for most vehicles in California.

Numbers at Start/Done: 10,101 miles

  • C02 16.5/17.1
  • 02 0.3/0.1
  • HC(ppm) 11/9
  • CO 0.17/0.10
  • NO 301/99
  • Compression
  • 27.1 mpg

Then the test began and the Auto-Rx® was put into the mix.

At the end of the clean (3k miles) and rinse (3k miles), the oil was changed every 5k miles. The Auto-Rx® Extended Protection Plan was to add 3 ounces at every oil change.

Numbers at Start/Done: 16,179 miles

  • C02 14.0/16.1
  • 02 0.1/0.0
  • HC(ppm) 5/2
  • CO 0.16/0.05
  • NO 231/80

There was a drop straight across the board.

  • Compression
  • 28.3 mpg

At the End of 10k Test Miles

Numbers at Start/Done: 27,206 miles

  • C02 13.5/15.1
  • 02 0.0/0.0
  • HC(ppm) 5/1
  • CO 0.15/0.03
  • NO 201/67

There was a drop straight across the board.

    • Compression
    • 28.5 mpg

This vehicle reflected a steady improvement in mileage and compression. The trend in compression was not only an increase but more even compression from highest to lowest.

The improvement in smog numbers was not a big change but was very clearly an improvement in all areas tested.

NOTE: Claims of better mileage results come from our customers. You can read their independent comments and decide for yourself!