[gumby79]

Just arrived this morning. About 8am as I've made arrangements to take cair of other things wille in town took in some scrap witch will cover the trip( at$ 42.07southbound 27.07mpg personal best for this leg) Wilco on PM.
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Steped up to Mobil Delvac 1300 Super Diesel oil
at 280,543mi could not pass up the opportunity. Napa has it on sale right now for $11.99($23 off sale) a gallon that's cheaper than the conventional Dello I get from Costco at $38 for 3 gallons... had some wind but not to much . No CEON sum 3-7 second intervals(100-300m ) on trucks mostly south of ID about 100mi from Ogden ,before I came on one that had a similar PTW (power to weight ratio) was pulling 625EGT @70-77MPH insted of 7-750 EGT dont know if if was my interval or synthetic oil.
Just imagineif I was willing to close the gap to sub 3sec and do what is referred to as illegal drafting. 30-35 mpg @70+mph is my guess but I'll never be willing to find out. ..
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Experiment conducted
Removal of headacher rack, running as a fixed cap.
Slid 1/8"from touching the cargo light. No gap fill front or back.

Results 2 tanks dated 9/6/2016
Northbound Anaconda Mt to Helena I-90 ,I-15 ,US12
25.89 mpg (US). 31.1 mpg (Imp). 9.09 L/100 km. 3.86 gal (US)/100 mi. 1301.61 Wh/mi
Southbound Helena, Mt to Anaconda, Mt
27.6 mpg (US). 33.13 mpg (Imp). 8.52 L/100 km. 3.62 gal (US)/100 mi. 1221.18 Wh/mi

Conclusion removal of the horns showed a minimum improvement with out closing the gaps . Had rain day before so cardbord cutout gap fillers had to be removed. (Also the first snow that lasted over 24hrs. ) winter is coming
Pic to fallow later .
Gumby Stay Flexible.