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It is crazy how varied it is from truck to truck. I have the same as yours but with the 6.4' bed. Using only Arco 87 octane, I haven't gotten worse than 17.8; 3500+ miles, mixed driving. Been averaging 18.8 with a best of 19.7 with almost all hwy on that tank. For sure around town the mileage drops off noticeably.
Ours are designed and tuned to run on 89.
Pretty darn good being that you live in CO and have 3.92's. Actually the 3.92 is likely a contributing factor by keeping the engine in a better rpm range than the 3.21 would.
...and there’s an app for that
...and there’s an app for that
I am aware that the higher the octane the less energy in the fuel. Conversely with the higher flashpoint of that fuel, the closer to TDC the spark plug can fire without risk of pre-detonation. This will give you more power. Higher performance sports cars (Corvette, Hellcat, etc.) all recommend 91 octane (same as "performance" tunes) for a reason.
It's clearly stated on pages 520 and 525 of the 23MB 645-page owner's manual.What?! Why didn’t I know this?!
There are tons of variables besides driving style. Road types, inclines, traffic patterns, etc., all make a difference. My wife had tires with a 70K mile warranty and they were down to the wear bars in 25K miles. She doesn't drive hard and I rotated the tires every 5K. My tire shop was not surprised as they tell me that SoCal roads eat tires. I'm sure the road surfaces play into my MPG being lower than many.
I don't go that far but hand calculate at every fill-up to see where I'm at. My hand calcs are about .5 mpg below the computer's calculation on average. If I'm lighter on the throttle it's little closer to the dash readout and if I'm heavier on the throttle then it's a bit further away from the truck's calculation from that nominal -.5 mpg for my hand calcs.
You do not know your real average unless you hand calculate. Your truck takes a lot of stuff into consideration to calculate on the fly and tallies it for your live overall mpg display. The bigger the equation the more chance for errors and differences due to rounding during intermediate steps. You can't escape miles driven divided by gallons used. That's your true fuel economy whether you choose to calculate it or not.
I use Fuelie, per my signature. It will permit you to track maintenance, etc., as well, but I personally track everything in a spreadsheet via Google Sheets (for access anywhere) and also post self-performed maintenance in the Ram owner’s portal.
that is why I always get the 3.92, I agree, I think it keeps the RPS better... and while I am cruising on a 45 mph stretch of highway, or the freeway, it will go into eco mode much faster, and longer...
I am aware that the higher the octane the less energy in the fuel. Conversely with the higher flashpoint of that fuel, the closer to TDC the spark plug can fire without risk of pre-detonation. This will give you more power. Higher performance sports cars (Corvette, Hellcat, etc.) all recommend 91 octane (same as "performance" tunes) for a reason.
These days just about everything late model has a knock sensor that can adjust timing automatically as you drive. "Back in the day" you bumped up a grade (87 to 89, 89 to 91) if you had knocking to raise the flashpoint to stop it. The only way to retard the timing was manually so you had to do it yourself or take it to a dealership/mechanic.
It's clearly stated on pages 520 and 525 of the 23MB 645-page owner's manual.
It also says don't use gas that's more than 15% ethanol.
There are tons of variables besides driving style. Road types, inclines, traffic patterns, etc., all make a difference. My wife had tires with a 70K mile warranty and they were down to the wear bars in 25K miles. She doesn't drive hard and I rotated the tires every 5K. My tire shop was not surprised as they tell me that SoCal roads eat tires. I'm sure the road surfaces play into my MPG being lower than many.
I don't go that far but hand calculate at every fill-up to see where I'm at. My hand calcs are about .5 mpg below the computer's calculation on average. If I'm lighter on the throttle it's little closer to the dash readout and if I'm heavier on the throttle then it's a bit further away from the truck's calculation from that nominal -.5 mpg for my hand calcs.
You do not know your real average unless you hand calculate. Your truck takes a lot of stuff into consideration to calculate on the fly and tallies it for your live overall mpg display. The bigger the equation the more chance for errors and differences due to rounding during intermediate steps. You can't escape miles driven divided by gallons used. That's your true fuel economy whether you choose to calculate it or not.
Just my .04
Do you create a csv output file from Fuelie in order to populate google sheets? Did not think about the Ram portal, thanks.
