[johnmo]

quote me where i said def is a fuel

For someone who probably agrees with me, you're being a mite difficult.

 

[nireyn21]

Took a road trip to California and back over I-40 from Texas. Averaged exactly 52 MPG over the entire journey, ranging from elevations of 0 to 7200+ feet. Locked cruise at 76 for much of the way and it never downshifted, not once. Such a pleasure to drive over long distances. ~1 tank of DEF for 2600 miles.

 

[91794]

Rivergoer, to answer your question about "how DEF gives diesel an mpg advantage over gas engines" . Your question contains an implicit falsehood so there can be no answer.
In fact, the mpg advantage of diesel pre-existed DEF.

But today, DEF gives new diesels a chance to exist legally on USA roads, and thus to demonstrate their improved mpg over gasoline equivalents. Without DEF & related technology there are no new diesels on USA roads.

 

[91794]

DEF is required to keep my vehicle motoring on the highway, so i'm accounting for its cost as part of tracking my mpg. it's a small cost. but it's factual and obvious so it may as well be included.

this past weekend, 60 mpg on the 120 miles to portland maine, driving slower than usual on the highway. 65 to 70 rather than 75-80. Not counting DEF! subtract a couple mpg to account for the DEF gallons & cost.
So on the way to Portland I got a lousy 58 mpg if I include both DEF & diesel consumption, rather than the full 60 mpg by counting the diesel fuel alone. Argh!

52 to 55 on the way back due to running AC/defog/wipers and slightly higher speeds.

 

[johnmo]

DEF is required to keep my vehicle motoring on the highway, so i'm accounting for its cost as part of tracking my mpg. it's a small cost. but it's factual and obvious so it may as well be included.

Tires, filters, engine oil, brake fluid, radiator fluid, transmission fluid, blinker fluid, etc. are all also required to keep your vehicle motoring on the highway. What's factors should we apply to our MPG calculation for all of those items?

 

[91794]

Tires, filters, engine oil, brake fluid, radiator fluid, transmission fluid, blinker fluid, etc. are all also required to keep your vehicle motoring on the highway. What's factors should we apply to our MPG calculation for all of those items?

A chacun son gout. Muffler bearings used to be a joke too but now some mufflers have actual moving parts (solenoids?) if not bearings.

Sounds like you are talking about total cost of ownership with all that stuff above. TCO. Good to know and is not a mystery.

I’m talking about gallons of go juice. DEF & diesel. Two fuel tanks are refueled via the fillers inside the fuel door of the car - take a look and you’ll see them too. Don’t put brake fluid in there and don’t liquefy a tire and pour it in there!

There are two fuel tanks inside fuel door, so there are two mpg numbers which can be considered individually or with have their ratios weighted and combined. Do whichever arithmetic you prefer. I’ll stick with the rough estimate of subtracting a couple mpg from the diesel mpg in order to see the total mpg.

Ps - its cool that the manual says that burning diesel #1 during cold weather is supported!

 

[Rivergoer]

Rivergoer, to answer your question about "how DEF gives diesel an mpg advantage over gas engines" . Your question contains an implicit falsehood so there can be no answer.
In fact, the mpg advantage of diesel pre-existed DEF.

But today, DEF gives new diesels a chance to exist legally on USA roads, and thus to demonstrate their improved mpg over gasoline equivalents. Without DEF & related technology there are no new diesels on USA roads.

Alrighty then.

 

[Newbiecruzer]

This is a '17 manual 6 speed - driven 90% 2 lane rural S. Michigan and driving for mileage. This is the average of 10 tanks since new - 53.08mpg - 5650 miles.
Lowest tank 48.05 mpg - highest tank 58.82 mpg. I'm pretty happy with that.