Tahoe/Burb guys give me some MPG figures
 

Im not expecting 18MPG, hell 14 would be nice. But after the lift and 33" tires the Hoe is getting 10-11. MAYBE 11.5-12 on the interstate after my last fill up to the hunting camp. For the most part it doesnt bother me, its a big truck and holds everything I need it to in comfort. I only drive to and from work 8 miles round trip but hunting season is going to kill me. I also have about 5-600LBS of tools and winch in the back. Im thinking of trying to lighten it up some but not sure how much it will really help? All maintenance up to date and not throwing any engine codes. I keep it checked as I have a reader.

I think mostly its the 3.42s in the axles that are killing it, it has to shift alot on hills.

33's and 3.42's with a 4L60E's 30% overdrive is killing your milage. You need a set of 4.10's at leats for that size of tire. Most all stock trucks with 265's(31's) got 3.73's. Most all of the 3.42 trucks got 245's(30's). 12-14 would be good if you drive it conservatively. And just because the engine light isn't on, doesn't mean it is up to snuff. ONLY run AC DELCO platinum's or iridum plugs, good 7 or 8 MM plug wires, the blue marine grade cap and rotor, and the updated MPI conversion set for the injectors is another good investment since the stock poppets were crap even new.

I updated the spider when I rebuilt it. Its been a little while on plugs/wires so I may do them soon Ferm, thanks.


I drive like a grandpaw, my wife makes fun of me for it.

If you are interested. I've got an external injector mpi set up for sale. You'll need a wiring adaptor and some one to put a tune on it to take advantage of the setup

If I had known you had one of those, I would have made a detour on our trip to Jersey this summer.

Ive got an 05' 2500HD 6.0L and Im about where you are w/o the lift and 285's.

I checked it this morning. Avg of 10.8 so yea it sucks and I drive about like you do. Pullin the Wellcraft I get 8.9.....Did I win?????

With those gears and tires I would avoid using O/D

i've got a 02 tahoe 4wd w/ 5.3. pure stock with 265/70 16's yokohama geolanders 185,000 miles.. i just got back from a trip to st pete, all interstate. got 18 mpg keeping it at 75 , 2000 rpm. around town i get 14. we only use it for road trips and launching the boat. trailering to the keys, i got 11 mpg at 65, in trailer mode.

have you guys seen any feedback on the new dodge diesel 1500?

saw one of those trucks the other day, guy said he paid $48,900 for it. I just bought a 1997 F350 7.3/5 speed crew cab dually for $4000 with 175,000 on it. I figure i could have 12 of my trucks for what that new dodge cost. Kinda puts it in perspective

Ferm, I've actually got three of those set ups, two with no throttle body, one with a mercruiser throttle body. If you need one, let me know

I don't need one, but could always use one. I still know a few people with the old school VORTEC's, and they are fed up with the spider injection.

2000 Suburban (1500 4WD) averages 15-16 mpg, no matter how I drive it, except when pulling a heavy trailer or boat it drops a few. Stock size tires, though. It has 267,000 miles on it and it's still going strong.

Have you recalibrated your mpg taking into account the increase in distance traveled per revolution of your tire? You know how the speedo is affected, registering slower than your actual speed, the odometer is similarly affected.

You guys need to keep inmind you have LS based engines whereas STINK has an old school L31 VORTEC. So the 99+(new body style) WILL get better milage loaded than the L31 does. And if you haven't corrected your odometer yet, you need to add about 10% to what your getting for mialge. Add in the body lift and more aggressive tires, and it sounds like your getting about as good as you can until you regear it, put some headers on it, modify the throttle body, a cam, set of beehive springs and special retainers, match port the heads, gut the intake out(the stock L31 intake is RESTRICTIVE in stock form, I spent about 4 hours porting one to get it to flow decent), and a tune.

Or just deal with what you have.

My speedo is actually correct with the tires. It was always off with 245s, then got a little closer with 265s and is right on with the 285's. Its strange, thats chevy quality control for you I guess. Ive checked it with 2 different GPS's.


I do run it with OD off (in 3rd gear) when Im around the hunting property with all the hills and such. Pretty flat land where I live it. I still run it off occasionally, it definately feels like it "should" then. The overdrive is relatively useless in this truck with the current setup.

Don't always believe the speedo, but you need to check the odometer. 58 is 55 in mine, 62 is 60, 68 is 65, but 70 is 70. My odometer o nthe other hand is DEAD ON at all speeds. I adjusted mine using EFILIVE in my tuning though, so I can get it down to within 1 tire revolution per mile.

I meant speedo and odometer, Ive checked them both on GPS.

while your at it, I've got a couple marine 5.7 300 hp efi roller cams also