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I drive my Excursion around 700 miles every other weekend for visitation. I usually drive 65-70 round trip on US-58 to I-85 from Va Beach to Raleigh and back twice in a weekend and mpg is 18, maybe 18.5. I top off at the BP in hilltop and go. I went I-64 to Richmond and I-85 to Raleigh on the way back this trip and drove 80-90 most of the way with the flow of traffic. I got 19.7 hand calculated this trip. I made no changes and I am running the canned tow tune on the SCT. Is that normal? I don't usually go that fast, so I was wondering. My average for 14k miles of mixed city and highway is 17.4.

I am glad I didnt take the Liberty CRD. I just put a GDE tune that got my mpg up to 22-23 average thinking to get rid of the Excursion seeing as it's more than I need for me and my 5 yr old. But there is no way I'd have been willing to go that fast in the jeep, and it would have killed the MPG anyway. The excursion is a road trip machine and seems to handle well and have plenty of power, the jeep is dying off at 70. It'll go faster, but has to build up to it.

I am wondering if maybe a Looney tune would help the Excursion or if I should be glad of what I am getting considering I keep seeing folks complain of 12-14.
 

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My theory is you reach a point where no more fuel fits thru the line at a single moment and the truck still has speed left so you start gaining MPG when you surpass that point. Completely ridiculous I'm sure.
Maybe you had the wind at your back , temps outside were optimal , you got some fuel with a bit more than the 15ppm sulphur....
On a side note on a 2001 Freightliner classic with 500 Detroit and a 13 speed , i normally averaged 5.7-5.9 mpg. I came across I-40 in Arizona and New Mexico late one night in excess of 90mph most of the time and came in right at 7 mpg , best the truck ever did on fuel.
 

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I've found that every setup has a sweet spot. It depends on your engine powerband, gearing, wheels, aerodynamics, whatever. But when you find your sweet spot, you drive that speed. My old setup was a 7.3 w/ 6 spd. It loved 75, I could beat 20mpg all the way across Ohio. The new Excursion is a 4x4 auto with 4.30's and 10" wide tires - and it likes 62 :( .
 

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Your Interstate run gets you better MPG because it involves no stop-and-go.

Stop-and-go driving involves repeatedly accelerating up to speed and that requires additional energy to accomplish. Steady speed Interstate driving - even at a higher road speed - does not impose the acceleration penalty.
 
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