Originally Posted by Cmweed
to try to make me happy about my jeep getting 5 less mpg.
I can certainly commiserate about low fuel efficiency on an EcoDiesel.
However, you would be better off measuring your fuel efficiency using the European approach of L/100 km, which is notionally like gallons per mile rather than mpg (that is to say, the inverse).
The reason is that if you imagine a 10 mpg
vehicle dropping to 5 mpg
(i.e. a loss of 5 mpg), that is a substantially different change in fuel economy than a 30 mpg
vehicle dropping to 25 mpg
. The former is a change of approximately 25 L/100 km
, while the latter is a change of approximately 1.5 L/100 km
—basically an order of magnitude difference in absolute fuel economy delta when comparing the "same" 5 mpg drop.
Your Jeep will display L/100 km in EVIC if you switch the display mode to metric. You can use this to roughly calculate the cost to travel 100 miles, as 1 L/100 km is approximately 0.5 gallons/100 miles
; therefore, a drop of 1.5 L/100 km in efficiency costs approximately 3/4 of the price of 1 gallon of diesel more to travel 100 miles (fuel costs only)... call it $2.50 more per 100 miles currently?
Not that it should mollify your irritation with the drop in efficiency, but at least you can perceive the absolute effect on efficiency rather than having to rely on the misleading mpg figure. I know there's a subconscious element; I'm happiest when I'm cruising at >30 mpg, even though the cost savings might be negligible.