2013 Infinti JX35: Wyoming Adventures Part 1 -- Fuel Economy
August 16, 2012
First, the facts then the numbers. Similar to Oldham on his vacation, I used Sport Mode exclusively, but per Infiniti's recommendation, I filled the JX with 91 octane fuel every time.
My trip was 2,679 miles long and I averaged 20.8 miles per gallon -- 3.4 mpg better than Oldham, who makes no claims to be a hypermiler. Nor am I, of course, but this is a substantial difference which I can't easily explain.
I can't complain about the JX's range. My best tank was good for 401.6 miles during which the JX consumed 19.251 gallons from its 19.5-gallon tank. Six of the eight fill ups I recorded on this trip exceeded 300 miles. My best tank was 22.2 mpg and my worst was 19.3 mpg. Probably 95 percent of these miles passed on two- or four-lane roads and the trip included two trips across Utah, which has segments where the speed limit is 80 mph. I did very little city driving.
Also, all else being equal (which it never is, of course), no case can be made for saving money by using regular 87-octane fuel in the JX. Had I averaged the same fuel economy as Oldham did on his trip and used 87-octane fuel, I would have spent $67.76 more for fuel to complete this trip (using the U.S. Energy Information Administration fuel prices for August 13, 2012).
The EPA rates the JX at 18 mpg city, 23 mpg highway, 20 mpg combined so my highway number falls at about the EPA's combined rating.
Josh Jacquot, Senior editor