Poor MPG

[adrianp89]

Yes, the manual says 87 is OKAY. However, it RECOMMENDS 89.

From this thread, I seem to do just as good, if not better with gas mileage with 87. I see no reason for 89.

 

[xrsman]

My best before my lift and tires was 9.8 L/100 kms doing 90 kmh on cruise. (24 US MPG) This was with a hemifever custom tune (91 octane) S&B CAI, and MBRP Cat back.

My best on the same road doing the same speed after the lift and tires was 11.3 L/100 kms. (21 MPG)

My best ever mileage since my lift was 10.28 L/100 kms. This was my first crack at hypermilling. I did 80 kmh on cruise and was very light on the throttle. That's 23 MPG.

I average around 17 mpg mixed driving. All the short trips I do around town and to work realy throw my mileage off. If I was strictly driving highway I'd get high 11's to low 12 L/100 kms all day long. (19-20 MPG)

 

[tsc]

2015 crew 4x4
5.7L
6 speed
3.55
Normally 87 (because I forget to put in 89).
No modifications except adding Nerf bars (maybe reduce aerodynamics??)

I average 18mpg. My best was 19.4 mpg (according to fuelly.com) but I average 17.9-18.2 mpg--again with fuelly doing my math.

I drive about 100-110 km/hr 80-85% of the time (60-65 mph). I get to speed legally at work and not have to pay the fuel bill

 

[Goatman91]

Yes 87 is "ok" with 87 that knock sensor is working it's ass off, I ran 87 for 3 months when I first bought my truck and my milage sucked, I started running 89 octane and after the 2nd tank I noticed a huge difference, the difference in price is not that bad. I'd rather pay 10 or 20 cents more and get 2 to 3 mpg more. Just my 2 cents.

 

[jon0m0berry]

2010 5.7 crew cab 4x4 3.92
econoaid throttle body spacer, drop in k&n filter and tonneau cover
I get 18-20mpg highway doing 70-75 have seen 22-23mpg at 55-60 but that's at ideal conditions, level straight road, cruise control, clean truck etc... also ive noticed almost a 1.5-2 mpg drop using 87 octane. getting 89 octane might cost a few $ more per fill up, but youll see the pump less. it is more cost effective to run 89 octane. I also don't go off what the truck is telling me I get for mpg. that's me doing the math and even making sure I use the exact same pump everytime to remove variables in my mpg calculations

 

[adrianp89]

Put in 89 yesterday to see what difference I will get MPG wise. Only $6 more over 30 gallons.

 

[mbrimmer]

14 ccsb sport.
3.92 rear 8 speed
Soft tri fold tonneau
Flowmaster outlaw direct replacement muffler
87 octane 10% ethanol
Everything else stock
15.5-16.5 mpg by hand, 17-18 on dash. Hilly 55-65mph commute.
Evic is so far off my last tank I got 12.3mpg dash said 16.6. And I have tried the 4cyl deactivation vs. 8 burnin all the time and there is no difference for me.

Sent from my SM-G900V using Tapatalk

 

[RLJ10X]

Casper wrote the reply that I would have.

I will add tho, that on occation, the truck will do as good as 20.6. < That's the exception. Not the rule. 64 mph is my cruising speed.

I have a very hard time believing the guys that say they get 20+mpg at 70-75 mph.

To the guy that doesn't like his 5 speed tranny. Put in 4.10s. You'll change your mind.

 

[ram5.7hemi]

2015 dodge ram quad cab. 6 foot bed. 3.21 gears hemi 8 speed.. i get about 18.5 on the highway or so depending on hills and stuff... my trucks has had a small load in the bed since day one... must have stuff for work... and now I'm curious how accurate the evic is... i do lots of highway drives for work to the next town then driving around that town for work and eating lunch etc... never thought to fill up and see what i am getting strictly highway...

according to my iPhone app I'm averaging about 16 mpg total miles city and highway since I've bought the truck.

 

[Nick1500Josh]

I too have read soo much about using 89 will give you 1-2 mpg more, but if you look at the break down, its really doesnt save you anything. I was curious so I did the math at four different fuel amounts. Hopefully it comes out pretty clear.

87=2.2$/g (assuming 16mpg) ; 89=2.51$/g (assuming 18mpg) ; cost dif./millage dif

32gal - 71$ (512 miles) ; 81$ (576 miles) ; 10$ (64 miles)
25gal - 55$ (400 miles) ; 63$ (450 miles) ; 8$ (50 miles)
15gal - 33$ (240 miles) ; 38$ (270 miles) ; 5 $ (30 miles)
10gal - 22$ (160 miles) ; 25$ (180 miles) ; 3$ (20 miles)

So as you can see even if it were to give you 2mpg more, its essentially the same. Sure you have to stop at the pump less amount of time but your still spending the same amount of money, actually more. Using the 32 gallon fill up as an example, you spend 10$ more and gain 64 miles. YAY butttttt, if you put that same 10$ into the 87 at 16mpg you get about 4.5 gal and 72 miles.

Again these are all basic basic calculations but as far as I can see the only difference is what 'someone says'. I have never ran anything besides 87, from the cheapest gas station around (even no name places) and have not had a problem due to fuel on any of my vehicels. They have all lasted me 200k plus. My most recent vehicle was a 2005 suburban with 240k and it ran 100%.

 

[Rzrman328]

It's all a conspiracy.

 

[SilverSurfer15]

FWIW.. when I lived in FL and drove 60 miles to work strictly flat highway, I couldn't bust 20mpg at 55mph the whole time. Although moving from 55-65 didn't seem to change it much. I stayed in the 17.5-19.1 area (these are all hand calculated, I don't remember what the EVIC said, 21-23 ish IIRC).

Now that im in DC, and commuting 9 miles in pure city, I haven't hand calculated it lol. But the dash says 11-12 soooooo not too good im assuming.

I don't think anyone is doing much better than 15-17mpg. Im not going to start a debate, but when you see people claiming 23-25 I can assure you that's on the dash and not real. My ecodiesel truck would do about 15-17 mild city driving and about 26-29mpg on that same flat trip depending on speed (hand calculated, EVIC was way off in the mid 30s). Just to compare the two... 2wd EcoDiesel with 3.55s.

I am 2wd CC 3.21 gears 87 octane stock with magnaflow muffler.

 

[SlowRoller]

It's all a conspiracy.

Oh yes,,, The US gubberment, big oil, and even the *********s are all in on it too!

=)

 

[adrianp89]

Oh yes,,, The US gubberment, big oil, and even the *********s are all in on it too!

=)

It's Obama's fault.

 

[Rzrman328]

Thanks Obama.

 

[Space Monkey]

2010 QCSB 5.7 4x4
3.92 rear
18" Magnaflow
Leveled
35's on 20" clads
No tonneau cover

85 mile round trip to work @ 60 mph on 2 lane roads through 3 towns with several stoplights and both the EVIC and calculated 16.9 mpg.

 

[smiley]

You have to hand calculate. You have to compare gear ratio and transmission to be fair. You also should include tire size.
89 will get you a little better MPG and power difference from 87 will be noticeable IMO.
Here is my fuelly with 4.56 gears/ 5 speed teams and 275/65R20 tires. I drive a minimum of 60 miles a day 5 days a week.
http://www.fuelly.com/car/dodge/ram_1500/2009/smiley3303/313035

 

[Kidder]

2011 Crew Cab w/camper shell
3.55 gears
4wd
13.1 - hand calculated (Fuelly)
95% city driving
89 octane
No performance mods

 

[Nick1500Josh]

I love how people put how many lanes and towns their commute goes through,....as if that affects your mileage.

 

[SilverSurfer15]

I don't understand why people get v8 1/2 ton trucks and then complain about the mpg when its normal. If you want a truck that will get 20mpg and still have the "utility function" available, get a Tacoma. Not a half ton truck.

Of course I assume that the following is common knowledge:

1/2 ton trucks get 15-19 mpg

3/4 gassers get 10-15, diesels get 15-19


^^^^ pretty common averages, never buy anything trying to be the exception to the rule....