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2017 Chevrolet Silverado SLT 6.6L5P
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Discussion Starter · #1 ·
Hey everyone. So recently ive been driving daily 40km all highway. Been empty, 95-110km/hr. Usually 11-14l/100km. Just last few days get between 18-22l/100km. Nothing has changed, haven't filled up, driving the same. Idle the same.
Any ideas??
 

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2015.5 Chevy 2500HD LML Duramax LTZ Z71
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Without bald eagle units Im lost. But maybe the fuel you got was bad. Maybe try some hotshot edt
 

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2017 Chevrolet Silverado SLT 6.6L5P
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Discussion Starter · #4 ·
Okay. I'll fill up somewhere different next time and see what happens.
 

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2022 2500HD High Country
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1,090 Posts
Definitely sounds like you just filled up with summer fuel and the previous tanks @ 11-14/100km was on winter fuel. You'd have to know if where you've been filling up has a quick turnaround on their fuel or not. If they don't get much diesel fills from the tanker, it may have been a mix of winter and summer for however long the last fill up was.
 

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Definitely sounds like you just filled up with summer fuel and the previous tanks @ 11-14/100km was on winter fuel. You'd have to know if where you've been filling up has a quick turnaround on their fuel or not. If they don't get much diesel fills from the tanker, it may have been a mix of winter and summer for however long the last fill up was.
@TrevKers indicated fuel he just bought gave the 18L/100km.

With the 'litres per 100 kilometers' method, lower numbers are better, since it they indicate less fuel used to travel 100 km.
(I prefer metric for lots of things -- but L/100km aggravates me; I'd have been fine with km/litre...)

11 L/100km = 21 usmpg
18L/100km = 13 usmpg

Trev may have got his fuel consumption numbers reversed, but -- 21 to 13 seems an extreme drop for summer vs winter
 
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2022 2500HD High Country
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Hehe, you know us 'Mericans, we don't do the metric thing very well! I definitely mis-read his post, just kept thinking, higher front number better mpg's! LOL!
 
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2017 Chevrolet Silverado SLT 6.6L5P
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Discussion Starter · #8 ·
well, I just got back from a long 800km ish trip. empty, no excessive weight. I was amazed. The economy was as low as 7.7L/100 and an average of 10.9L/100 over the whole trip. I believe that must have been the fuel or something else. I've filled up at random gas stations along the way, and no anomalies.
Metric is so easy. just need to use it more :)
 

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2022 2500HD High Country
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Well,let's see if I got it right. 7.7l/100km is about 30.5mpg? and 10.9l/100km is about 21.5mpg? Do I win a prize now? Maybe a beer (so long as its not Labatt!)?
 
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