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  #1  
Old 02-25-2014, 08:20 PM
jmacbeth1 jmacbeth1 is offline
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Default Fuel Economy Progressively Plummeting! Help!

Hey so I've my 09 sport has the 5.7 and I used to get awesome fuel efficiency, upwards of 13.9L/100 hwy (20 MPG for you Americans) and life was good. Lately I've been getting upwards of 20 L/100 on average (around 14MPG) and I can't figure out why... I had the dealer do a full tune up about 25,000 km (15,000 M) ago with plugs, injection and throttle body service. I'm also running synthetic oil and I've checked the air filter and all of the obvious causes (tire pressure, etc.).

I'm currently running an S&B intake with an Air Raid throttle body spacer. I haven't gotten around to the programmer or cat back exhaust yet but its on the list. Could my mods be screwing with air/fuel to the point it pooched my cat??

I did buy larger tires - Toyo Open Country AT2's (295/60R20)... yea I know they'll effect economy but that much? My buddy has an 11' ram sport with 37x13.5's and hes killing my economy... I don't get it. It's hasn't flipped any codes. Anyone have any ideas? EGR?
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Old 02-25-2014, 08:29 PM
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I was getting 17.4 MPG highway at 73 MPH
now i am getting 14.6 MPG highway at 73 MPH

I have to assume that it is just the Winter Blend gasoline

I am waiting to see Summer Blend gasoline sometime in May, hopefully my MPG will climb back up
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Old 02-25-2014, 08:33 PM
jmacbeth1 jmacbeth1 is offline
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Ya I considered that... but I don't remember it being this bad last winter.
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Old 02-25-2014, 08:47 PM
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I've noticed this as well and suspect that the winter gas and extreme cold has alot to do with it. Can't wait for summer gas and warm temps.
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Old 02-26-2014, 07:30 PM
jmacbeth1 jmacbeth1 is offline
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OK so this is really strange. Disconnected my battery yesterday to change a headlight bulb and when I reconnected it my mileage was back to normal... and its staying there. I thought it just reset average but I did that a few times before and every time it would shoot right back up to 21L/100. I drove 100 km today and its getting 15-16L/100 Km consistently. Does anyone have an explanation?
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Old 02-27-2014, 08:33 AM
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It's amazing what the temperature will do.
The other day it was 9c and I was getting under 14L/100... Yesterday it was -5c and I'm almost at 15L/100 with the same driving style.
I figure once it gets to 25c, my truck will be making gas all on it's own!
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