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4.8 Mileage

dalez

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kevinz92702 Enthusiast

kevinz92702

Posted
Posted

Last time I calculated it, I was getting around 15 mpg. However, that is with the crappy sending unit for the fuel gauge, so I may not have understood how much gas was actually left in the tank at time of calculation. Also, my truck has a v-force muffler and k&n intake; possibly some computer programming, but I got it that way. It may need a tune up also. I think the average number is around 20-ish.

 

kevin

Worktruck Enthusiast

Worktruck

Posted
Posted

I do allot of highway driving and I have a heavy foot. If I drive like a normal person I can get around 18 mpg. But at 75-80 mph I omly get 13-14 mpg. I think the 4.8 is to small of a motor for these big trucks. Next on will have a bigger V-8 or maybe go to one of the deisels.

jhm Senior Enthusiast

jhm

Posted
Posted

2001 4.8 4x4 ext cab. Average 14.8 mpg. That is basically rural driving, might be better on long trip, havent calculated that because 90% of my driving is rural.

MS3DALE Senior Enthusiast

MS3DALE

Posted
Posted

My '99 ext.cab 4.8 4x4 got around 16.5 back and forth to work and I could get almost 19 on the highway if I kept my foot out of it!

But to be honest the 4.8 didn't get any better mileage than the 5.3 that I have now.

sjspor Enthusiast

sjspor

Posted
Posted

Your Rear End is going to play into this as well, a 3.42 will most likely get you another 1 or 2 mpg over a 3.73.. It's just slower off the line

jhm Senior Enthusiast

jhm

Posted
Posted

I wonder if everyone is calculating the same way. When I go to fill up, I write down the present mileage and fill until the nozzle clicks off, no topping off. Next time I fill up I write down the mileage and the gallons it took. Then I subtract the first mileage from the new mileage and divide that number by the gallons. I also try to use the same pump each time just because there could be a slight incline or decline at another place causing the nozzle to click off at a different level.

Draphty Enthusiast

Draphty

Posted
Posted

I'm getting 16 around town, and 18 on the hiway. Magnaflow dual exhaust, K&N FIPK GEN II. Also, mine came from the factory with 4.10:1 gears. I'm very impressed with the power...but I do know the gearing is what makes it jump so hard. I saw a noticeable improvement in power with the K&N and the exhaust. I towed a U-Haul Car trailer loaded with a 73 Chevy truck from here in Texas to Alabama a few weeks ago. I figure 6000 to 6500 lbs. I got a solid 10 mpg. Handled the load with not problem.

So...basically, I have no complaints with my 4.8.

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