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Old 11-14-2005, 07:22 PM
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GM Truck Gas Mileage

Just wondering what those of you with GM trucks and SUVs with the 5.3 are getting for gas mileage while towing. Just got back from my first long distance tow of approximately 1200 miles round trip and would have to say I am a little disappointed.

I have an '03 GMC Ext Cab Shortbed 2wd with the 5.3 and 3.55 gears. It has 70k miles on it. Generally in combined driving of about 60% highway 40% in town I get a very consistent 18mpg which I think is pretty darn good for a full sized truck. I used to do some short tows of about 40 miles round trip but it was always mixed in with normal driving. I saw the mileage drop but not all that much when say two round trips of 80 miles was factored in over a tank of gas.

Over this past trip all just towing my 190's which would mean a load of just over 3200 lbs boat and trailer I averaged right at 13 mpg over the trip . Best tank was 13.1mpg and worst was 12.8mpg. Now this was a pretty flat trip but spead was pretty much 75mph the whole way. Is this what others are experiencing?

Everything I hear here and elswhere is that the Hemi Dodges suck the gas. 13 mpg makes me ill so if the Hemi gets that mileage in general and worse towing I am sure glad I don't own a Dodge
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Old 11-14-2005, 07:29 PM
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sounds normal to me
Do you have OEM tire diameter?
I don't, so my mileage is innacurate when calculated per my odometer. Mine is a 6.0, 4x4 crew with 3.73 gears and I get around 12ish at best towing fast like you.

Quote:
Originally Posted by BrianM
Just wondering what those of you with GM trucks and SUVs with the 5.3 are getting for gas mileage while towing. Just got back from my first long distance tow of approximately 1200 miles round trip and would have to say I am a little disappointed.

I have an '03 GMC Ext Cab Shortbed 2wd with the 5.3 and 3.55 gears. It has 70k miles on it. Generally in combined driving of about 60% highway 40% in town I get a very consistent 18mpg which I think is pretty darn good for a full sized truck. I used to do some short tows of about 40 miles round trip but it was always mixed in with normal driving. I saw the mileage drop but not all that much when say two round trips of 80 miles was factored in over a tank of gas.

Over this past trip all just towing my 190's which would mean a load of just over 3200 lbs boat and trailer I averaged right at 13 mpg over the trip . Best tank was 13.1mpg and worst was 12.8mpg. Now this was a pretty flat trip but spead was pretty much 75mph the whole way. Is this what others are experiencing?

Everything I hear here and elswhere is that the Hemi Dodges suck the gas. 13 mpg makes me ill so if the Hemi gets that mileage in general and worse towing I am sure glad I don't own a Dodge
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Old 11-14-2005, 07:30 PM
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Quote:
Originally Posted by Ric
sounds normal to me
Do you have OEM tire diameter?
Yep, OEM size 255/70/16
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Old 11-14-2005, 07:38 PM
ted shred ted shred is offline
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That doesn't seem to bad considering your speed. Was this in overdrive? I have found sometimes it's best to go slower with the tranny in drive as it keeps the rpms in the most desirable range for good torque from the motor.
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Old 11-14-2005, 07:43 PM
rodltg2 rodltg2 is offline
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just did a long tow of about 400mi. i averaged 10.9 after installing a cool air intake. im happy. i was getting about 9.5.
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Old 11-14-2005, 08:02 PM
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Quote:
Originally Posted by BrianM
Everything I hear here and elswhere is that the Hemi Dodges suck the gas. 13 mpg makes me ill so if the Hemi gets that mileage in general and worse towing I am sure glad I don't own a Dodge
I think you're right, but, unloaded.
From what I've seen with buddies trucks, loaded, they are pretty good. The problem is, how often is a guy towing 4000+ lbs.
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Old 11-14-2005, 08:08 PM
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That beats my F150 with the 5.4L Triton. I get about 10 mpg whenever I tow my 197 on the interstate.
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Old 11-14-2005, 08:14 PM
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Quote:
Originally Posted by ted shred
That doesn't seem to bad considering your speed. Was this in overdrive? I have found sometimes it's best to go slower with the tranny in drive .
I tow in drive with the transmission in Tow Haul mode. RPM at 75mph was about 2150. I am sure that driving 60 mph probably would improve mileage substantialy but I am not willing to sacrifice hours of my life for a little better mileage. 1200/75 = 16 1200/60 = 20.

Quote:
Originally Posted by Andyg
That beats my F150 with the 5.4L Triton. I get about 10 mpg whenever I tow my 197 on the interstate.
Guess I am doing pretty good considering the circumstances (higher speed). Was just checking to see if this was normal. I'll consider myself lucky and just go back to telling myself that I have to pay to play.
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Last edited by BrianM; 11-14-2005 at 08:16 PM.
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Old 11-14-2005, 08:16 PM
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My '04 Yukon gets about 15mpg. Haven't towed with it yet since I have the P'stroke. But I may take it 1000 miles with the sleds on it in a few weeks. If I rememeber Ill post my results.
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Old 11-14-2005, 08:21 PM
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Yes thats pretty good. A friend of mine has the 6.0 Chevy that he pulls a Ranger bass boat with. I think he is lucky when he gets 10 mpg. I rarely pull with my Yukon and never in overdrive, I think it runs around 13mpg towing. My Powerstroke gets 17 with or without the boat.
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