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post #1 of 9 (permalink) Old 07-13-2014, 05:38 PM Thread Starter
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Vacation Gas Mileage

Just got back from a 3,600 mile vacation. I rarely ever check my gas mileage, but decided to keep track over vacation.

I have a 2012 crew max 4x4 with 5.7L flex fuel engine, stock tires, four people in the vehicle (two adults, two kids), a crossover tool box and a large seperate tool box filled with luggage. Driving consisted of a mix of Interstate driving of 75-80 miles an hour, highway driving at 60-70 thru mountaitn passes and City driving in Los Angelas area.

Overall average was 17.75 mpg (hand calculated). Which I felt was pretty good for up and down mountains and stop an go traffic in the City. There were tanks where I was over 21mpg, low was 14.6.
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post #2 of 9 (permalink) Old 07-13-2014, 07:13 PM
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That's pretty awesome mileage. Mine was only stock for a very very short time and my wife is the only one who really drove it then as I was out of town but she couldn't touch that. I think she averaged just over 16.

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post #3 of 9 (permalink) Old 07-13-2014, 07:22 PM
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Originally Posted by tjm View Post
Overall average was 17.75 mpg (hand calculated). Which I felt was pretty good for up and down mountains and stop an go traffic in the City. There were tanks where I was over 21mpg, low was 14.6.
Huge road trip planned for August-Sept. Over 6500 miles planned out. I'll be curious to see how much I blow on gas with 35's driving all that way. I've got $2k budgeted for fuel.

I wasn't going to keep tank by tank stats, but seeing the high and low you posted above makes me curious to see where & what my high/low will end up being.

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post #4 of 9 (permalink) Old 07-13-2014, 08:29 PM
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Coming down from the continental divide you should be getting pretty good fuel mileage.
That's a good distant to calculate from also.


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post #5 of 9 (permalink) Old 07-13-2014, 10:12 PM
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We did ~2800 miles at spring break to Orlando and back. I calculated every tank by hand and my best was 17.3 and worst was 12.2. Worst was after 11 hours on the road and made that turn south in FL towards orlando. I was just ready to be there. That stretch I averaged 80mph or so. The rest was the speed limit +5 or with traffic if it was a little more than that. Overall average for our trip was 15.5 in my '14 CM 5.7 2WD TSS, all stock.

I don't think I can touch that milage. Don't know why, but I can't. Might be the BFG A/Ts that came with it stock, but I won't have a comparable until I replace them when the time comes for new rubber.

You did pretty dang good, IMO and experience.

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post #6 of 9 (permalink) Old 07-13-2014, 11:18 PM
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My experience has shown that once you get above 70mph, MPG really takes a dive in these trucks.


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post #7 of 9 (permalink) Old 07-14-2014, 01:50 AM
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My experience has shown that once you get above 70mph, MPG really takes a dive in these trucks.


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^true. I recently took a 246 mile trip where I never went over 70mph (highest speed limit was 65) and thru 4-5 small towns I had to drop down to 45-55mph for 1 mile then back to 70mph. Overall mpg was 19.2mpg on cruise control 98% of the trip. 2WD 5.7 Crewmax on 275/55/20. All stock.

On longer mostly highway trips where I'm at 75-78mph, I average between 17.5-18ish mpg.
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post #8 of 9 (permalink) Old 07-14-2014, 03:05 AM
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I just did a 1500 mile round trip on flat ground (Midwest) pulling an 18' car trailer. 750 miles the trailer was empty and I averaged 15.5 mpg. Loaded with a 2200 lb car I averaged 13. I never exceeded 70 mph (75 speed limit) and babied it without the cruise. My best ever completely unloaded is 17.5 mpg....I have no clue how you guys are doing it. 07 DC 5.7 4x4 all stock.
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post #9 of 9 (permalink) Old 07-14-2014, 06:19 AM
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My best was 17.1. Oddly enough, I was in the Tennessee/North Carolina mountains as well getting that mpg. Must be you get much better mpg going down hill than what you spend going uphill. I dunno?

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