[johnmo]

I'm averaging better than 55 MPG overall. I raised my best 25-mile average to 72.5 when the weather got cool earlier this month. Very happy with the fuel economy.

 

[johnmo]

That's crazy John. No way mine can get anywhere near that right now unless its on perfectly flat ground. Im 7/8 through my 2nd tank but it seems my mileage has really taken a dump in the last 100km or so. Went from 5.2l/100km to 6l/100km average with not much change in driving style or conditions. How many miles are on your car?

I have 16,000 miles on mine now. My commute is about 52 miles each way and mostly follows a river, so it's relatively the same altitude, but I do have to summit a good-sized hill on both ends. Speed limits are 55-60 MPH for the majority of the trip, which helps. I almost always see 60-something on my 25-mile average each way during my commute.

I think I could average 70MPG on a whole tank if I had enough flat ground. I'm hoping to see 800 miles on a single tank at some point. My last 60+ MPG tank was teasing 800 miles (trip odometer + range to empty) the whole way, but circumstances didn't align to let me test it.

 

[johnmo]

Did it take a while for your engine to brake in before reaching those numbers? My mileage isn't bad by any means but its not really close to what you guys are getting. Sure with cruze control on flat ground I can get them but there's no way I can average that for an entire tank yet. I doubt I'm going to even hit 800km (500 miles) this tank, 800 miles just sounds impossible. Definitely have more stop and go traffic and more spirited driving this tank vs my first but its going to be interesting to see if it gets much better.

Mine was good from the start. I think fuel economy is improving as the engine breaks in more, but my first 60MPG tank was at 4000 miles and I've never had a tank lower than 52MPG, which is the EPA highway estimate.

My driving style varies a lot. Some tanks I intentionally drive for economy, but after driving so conscientiously and carefully for a whole week and 700 miles, it gets old and I just set the cruise or do some more spirited driving. The cool thing is that even when pushing for a high mileage number, it's pretty forgiving of a few heavy-footed moments.

One thing I have noticed this month is that it really likes temperatures in the 50s and 60s. I got to 60MPG on my 50-mile average this morning and wasn't even trying. It's in the low 60s this morning.

 

[johnmo]

Yeah that's insane. Do you do mostly highway driving on flat land? Just filled my 2nd tank only got 734km and the dash showed 40mpg. The app I use to track fuel shows it as 37.5mpg but part of that reading is I don't think I fully filled it the first time. Didn't really think about how much diesel foams up when filling. This time I started squeezing the handle really slowly for the last few litres. Is yours manual or automatic? Mines manual and I struggle to hit the shift light as it seems like it's too little rpm for the engine especially if there is any hills involved. The light comes on at like 1700rpm.

Most of my commute is 55-60 MPH on rural highway. Because of where I live, that's most of my driving no matter where I go. It's mostly gently rolling terrain, but there are two or three grades that are uphill for a mile or more.

My experience with the fuel computer is that it's pessimistic. My calculated MPG is usually higher by anything from a little to a lot.

I do take time to fill it to the top of the neck. Part of my reason for going with this diesel is that I only have to fill it once a week to drive the 600-700 miles I cover ever week. I'm OK standing at the pump an extra 3 or 4 minutes to get it good and full.

If I follow the shift indicator, it drops my RPMs to around 1500. I don't pay much attention to the shift indicator, but I've noted that the computer doesn't think it's lugging the engine too much at 1200-1500 RPM. It is a diesel.

 

[johnmo]

Calculating 7500 miles for $20 in DEF would be $0.0027 of DEF used per mile, so even more incredibly less.

My DEF cost (calculated it on another thread) is less than $0.002/mile. I agree that it's a very minor cost.

 

[johnmo]

We'll need a name and a Greek letter for this new constant.

:biglaugha:

DEF needs to be refilled and it gets burned up in order to make the car go more than 4 mph.
Please tell me again why DEF is not fuel and/or pony up and refill my cars DEF whenever it needs it? It's really a minor cost, not a big deal, it shouldn't be a problem for the hordes of DEF-is-not-a-fuel people to refill it on my car when necessary, you can each take a day of the week to check/refill my cars DEF as necessary. Thanks in advance !

DEF is not a fuel. DEF does not get burned. DEF is a consumable, but not a combustible. If you think it is a fuel, pour some in a bowl and throw matches at it until you can get it to burn or can admit it's not a fuel.

 

[johnmo]

i guess you dont consider diesel a fuel either, it meets your bowl and matches criteria for not being a fuel

Fine. Fill your fuel tank with DEF and see how far you get.

 

[johnmo]

quote me where i said def is a fuel

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

 

[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?