how is this possible, not calling you a liar. Mine reads 38% at 7000 miles all but 1-3% is highway travelling @ 60mph and no more, being a R/T no towing of coarse??????
Errrrr I have the dealer change the oil once a year or 2-4000 miles whichever comes first, no wait once a year thats it. Price is 130.00ish so not so bad. Several toys come out to the same or a wee bit more as a couple of engines require no never mind the toys all take 7 litres give or take. What, medication is the reason.
#1...When you have driven H.D. trucks for as long as I have, you learn how to work engine rpm/torque to your advantage
#2 Engine rpm never exceeds 3500 rpm...(see #1...lol)
#3 I NEVER use Tow Haul...Except when Snowplowing
#4 Truck NEVER exceeds 70 mph
#5 Flat roadway rpm @ 70 mph is 1500-1700...(see #1...lol)
#6 EVIC mpg is consistently at 12.8-13.3...(80% towing)
#7 MPG is most likely lower than others with the same truck, due to my dual alternators are putting a little more drag on the engine.
I will be doing all the oil changes at 5k mile intervals...So oil change #1 was @ 5k....Oil change #2 @ 10k...
Now in the winter things will change...Snowplowing requires much higher rpm's depending upon depth, moisture content, and length of plow run
Also when the snowmobiles are in the trailer and I'm chasing GOOD snow conditions, I'm a HAMMERDOWN on the pedal kinda guy...80 mph on snow covered roads are the norm for me when traveling to my riding destination...