Ways To Reduce Fuel Costs: One Method #1

This week, kicking off today, November 2^nd, is dedicated to “Ways To Save” while enjoying RV-ing. On that note, I have two blogs today.  Both focus on saving through the reduction of fuel costs.  One that really works, and one just to put a smile on your face.  I will leave it up to you as to which is which.

There are many ways that we can reduce fuel consumption while still using our class “A” coaches.  Some help more than others, but combined, all can add up to big savings.  I wish to discuss one. “Managing your Allison transmission to reduce fuel consumption.”

Though many vehicles are now available with the “Bullet Proof” Allison transmission, I want to look at the larger units generally found in today’s heavier vehicles which feature the “Economy Mode” function.

The EM function is probably one of the least used features that the Allison provides. This is probably due to most owners not entirely understanding how it works, when to use it or just plain forgetting to engage it.  Additionally there may be some skepticism in some owner’s minds as to whether in fact it really does save fuel.  So let’s look at how it works and when to use it.  The Economy mode, when engaged, causes the transmission control module to alter the shift parameters.  This change makes the transmission seek earlier up-shifts while also delaying down-shift events.  Essentially this causes the engine to run within the peak torque band more frequently by up shifting quicker when accelerating and maintaining a higher gear longer when decelerating.  Slower RPM generally results in less fuel.

The Economy mode can be engaged all the time if you wish, with the following exceptions.  However if you are driving a distance on an interstate where the terrain is generally flat, no benefit will be derived as the transmission will remain in high (6^th) regardless.   I would recommend that you do not use this mode if you are operating in the mountains climbing steep long grades, particularly in warm weather.  Running at these relatively low engine revolutions, during hard climbs, may build engine heat and reduce the overall cooling of both the engine and the transmission.

Driving with the EM engaged on secondary roads where speeds vary, or stop and go, works well and can bring out the benefits.  Also hilly terrain at all speeds will cause the transmission to shift less and again is an ideal application for it.  You will notice the difference and experience far less down shifts when slowing or climbing on hilly roads.

So, how much fuel does this actually save? Well there is no simple answer here as there are far too many variables.  But, over a distance where you encounter various geographical road conditions, it will be evident.  I’ve experienced from 0.01 to as high as 0.55 miles per gallon, or 0% to 7% better fuel mileage.  Again, it is dependant on many factors, but basically, will deliver the potential for a more economic trip.

So, if you have this great feature on your rig and don’t usually use it, give it a try.  Just remember, you must engage it each time you start your engine as it cancels after each use.  The mode button can be selected, or toggled from off to on at anytime, whether you are stopped or driving.

Well, if you have used this feature, we would like to hear from you.  What fuel consumption results did you manage to achieve?

Now don’t miss reading “Ways To Reduce Fuel Costs” #2  today too!

With a Fuel Saving Thought   –   Lug_Nut   –   Peter Mercer