On our return trip, we started out with 479 miles on the odometer and a full tank of gas. (We did have to put a few dollars of gas in to top off the tank.) The temperature in Ely was around 65 degrees Fahrenheit when we left back to St. George on August 12th. Just like before, we drove right at the speed limit or over by 1-3 miles an hour. We drove "normally" not focused on getting the best economy possible, but not pushing the vehicle at all either. Getting back to St. George that afternoon the temperature was about 98 degrees.
When we went to the gas station in St. George the next day (thus explaining the extra 3 miles vs. the trip to Ely of only 217 miles) and filled the tank up, the odometer had reached 699 miles, for a total driven of 220 miles. Again, this was almost all from highway miles at about 65-75 miles per hour.
The receipt below shows that we used 5.326 gallons of diesel fuel.
With 220 miles driven on 5.326 gallons of diesel, our trip mpg average came out to 41.30. Obviously an improvement over the 36.03 mpg we got on the uphill trip. The difference, in our opinion, was probably mostly attributable to driving uphill on the way there verses going downhill on the way back.
We decided to figure out a combined trip mpg average. 437 total miles traveled (217 going, 220 coming) with 11.348 gallons of diesel used (6.022 going + 5.326 returning) equates to a trip average of 38.50 mpg. Not too shabby for a brand new diesel.
Now that we had an unscientific but usable baseline mpg figure, it was time to start bolting on some aftermarket diesel performance parts and then measuring the difference these made. First up, an AFE cold air intake kit. Join us on our next blog post as we share some photos from that installation.
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