This month we hit the test track and ran numbers that seem to validate the SAE J1349 weather correction and testify to the Durango 4 R/T’s build accuracy and precision. Either that or they reveal an impressive coincidental tolerance stack: Our Durango 4 R/T was tested in frigid Michigan (29 degrees, 74 percent humidity, 30.2 inHg barometric pressure) exactly eight days after a nearly identical one weighing 7 pounds more and riding on matching Bridgestone Ecopia tires got measured in 72-degree SoCal with 6 percent humidity and 28.7 inHg barometric pressure. Correcting both to our “standard” weather conditions (77 degrees, 0 percent humidity, and 29.3 inHg) meant slowing the cold Durango’s raw numbers down by about 9 percent and speeding the warm one’s up by less than 2 percent.
The corrected runs align almost perfectly, with the cold Durango trading a 0.1-second advantage to 60 mph (in 6.4 seconds) for a 0.1 mph deficit in quarter-mile trap speed to the warm one (14.9 seconds at 92.9 versus 93.0 mph). The Russians drag racing our stolen Durango GT V-6 are running about 0.9 second and 4 mph slower. Other testing notes: Eco-On mode (the default upon startup) added about 0.2 second to the best quarter-mile time, which was achieved with Eco off, Sport mode engaged, automatic shifting, and no brake torque. Shifts happen well short of the indicated 5,950-rpm redline, but manual shifting slows the truck way down, and the cold brakes had some trouble holding a strong brake torque.
We have no formula for weather-correcting the lateral tire grip, which measured 0.77 g in the cold. Because these vehicles are so closely matched in performance, we’re “borrowing” the warm-test handling figures—0.80 g lateral grip and 27.4 seconds at 0.64 g average in the figure eight.
For grins I left our Vbox unit running on the 60-mile drive to the track and noted that the speedometer was in near perfect agreement with the satellite-defined speed info the entire way. Between the testing and frequent short commutes preceded by a remote-start warm-up over the past two months and 2,300 miles, our fuel economy average has dropped by about 0.9 mpg to 16.0. Here’s hoping that warming trends and longer journeys can elevate that number by a few points in the months to come.
Read more about our 2018 Dodge Durango R/T long-termer:
|2018 Dodge Durango 4 R/T (Long-termer)||2018 Dodge Durango 4 R/T|
|PRICE AS TESTED||$51,970||$56,555|
|VEHICLE LAYOUT||Front-engine, 4WD, 7-pass, 4-door SUV||Front-engine, 4WD, 6-pass, 4-door SUV|
|ENGINE||5.7L/360-hp/390-lb-ft OHV 16-valve V-8||5.7L/360-hp/390-lb-ft OHV 16-valve V-8|
|TRANSMISSION||8-speed automatic||8-speed automatic|
|CURB WEIGHT (F/R DIST)||5,426 lb (51/49%)||5,433 lb (52/48%)|
|WHEELBASE||119.8 in||119.8 in|
|LENGTH x WIDTH x HEIGHT||201.2 x 75.8 x 69.8 in||201.2 x 75.8 x 72.7 in|
|0-60 MPH||6.4 sec||6.5 sec|
|QUARTER MILE||14.9 sec @ 92.9 mph||14.9 sec @ 93.0 mph|
|BRAKING, 60-0 MPH||124 ft||127 ft|
|LATERAL ACCELERATION||0.80 g (avg)||0.80 g (avg)|
|MT FIGURE EIGHT||27.4 sec @ 0.64 g (avg)||27.4 sec @ 0.64 g (avg)|
|REAL MPG, CITY/HWY/COMB||N/A||16.0/25.1/19.1 mpg|
|EPA CITY/HWY/COMB FUEL ECON||14/22/17 mpg||14/22/17 mpg|
|ENERGY CONS, CITY/HWY||241/153 kW-hrs/100 miles||241/153 kW-hrs/100 miles|
|CO2 EMISSIONS, COMB||1.16 lb/mile||1.16 lb/mile|