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jeepgcoman 01-20-2011 08:31 PM

Another Fuel Economy Threadd
Just returned last week from an 800 mile (rounded to nearest mile) trip, starting in southwestern Idaho and traveling into southeast Oregon, across northern Nevada and easternmost Utah, and back to southwestern Idaho. All of the terrain was mountainous or high desert rolling mountains, at altitudes from 2400-7000 feet. Temps ranged from ~11-45 degrees, with relatively high humidity. Fuel ups were just before (no more than 3 miles) entering the highway and refills were immediately (no more than a mile) after leaving the highway. Speeds ranged from 58-70 mph with cruise on about 97% of the time. I am currently running the DS Predator, 91 tune.

Boise, Id-Winnemucca, Nv-254 mi-14.3 gal (87 oct)=17.76 mpg (2 stops)
Winne, Nv-Wendover, Ut/Nv-235 mi-12.5 gal (85 oct)=18.8 mpg (1 stop)
Wendover, Nv-Jackpot, Nv-130 mi-6.3 gal (85 oct)=20.63 mpg (1 stop)
Jackpot, Nv-Boise, Id-181 mi-9.0 gal (mix 85/87 oct)=20.11 mpg (1 stop)

That comes out at about 19 mpg average for the whole gambling junket. I would think the mileage would be a little better at lower elevations and more level terrain.
As a contrast, when in Wendover, after the initial arrival fill up, I drove 17 miles (all short 1-1.5 mile trips) around town?? and then filled up again before leaving. It took 1.9 gallons. That's a whopping 8.94 mpg in town. Short trips with no warm ups are really mileage killers.

I'll be taking the WK in at the end of the month for a custom set of short tube headers. Hopefully that'll improve the mileage a little.

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