How Good is my gas mileage?

[K5Blazerboy87]

Hi guys I got my 87 k5 blazer Silverado 5.7 liter 350 TBI engine and was wondering how good my gad milage is I got a 3 inch lift with 33s BF goodrich all terrains on it wondering how much to gallon I was assuming 12 to 13 in town and 16 on the highway and another thing will putting custom Bumbers on and a wench affect my gas millage?

 

[RangRayy]

Depends on how well your motor is tuned and last time you did a tune up. With 33s what gears do you have? OD transmission? Adding custom bumpers and a winch will add weight thus creating more rolling resistance which makes the engine work harder suffering in MPG And other things.

 

[K5Blazerboy87]

I just did few weeks ago new spark plugs, wires ,router, distributer cap

 

[Green79Scottsdale]

Do you know how to check what you are actually getting? Your driving a big @$$ brick of a vehicle, don't worry about the MPG's!!

 

[87scotty]

Do you know how to check what you are actually getting? Your driving a big @$$ brick of a vehicle, don't worry about the MPG's!!

Isnt that more reason to care cause 9 is alot better than 6

 

[87scotty]

But that is a terrible question only you know the fuel economy you can have tow of the same trucks with the same motor size tire size gears and they will still be diffrent

 

[1low4x4]

No where near 16. My truck in signature down there got 9.63 mix of highway and city. Checked with gps.

 

[mistaake]

When I owned a completely stock 95 Suburban 350 TBI iit got 11 average - that was about 75% city 25% highway. I'd say a lifted K5 won't do any better than that, if not worse. I'm grateful I have no idea what my MPG is since my odo/speedo are wrong and the gas gauge doesn't work.

 

[mr heavy-chevy]

i get 14-17

 

[foamypirate]

It's all over the board...

My 87' 1/2 ton with the TBI 305 and 700R4 got 17 highway, 13 city. 3.08 gears.
My 84', 1/2 ton with the TBI 305 from the 87' and a TH350, 10 city, 10 highway. 3.08 gears.
My 88' 3/4 ton with 6.0L LS and 4L80E, 14 city, 18-19 highway. 4.10 gears.

The one you'd expect to get the worst mileage does the best (though the modern powertrain helps!)

 

[adamj]

My 3/4 ton Burb with 33s + 3.42 gears + sm465 (no overdrive) is getting 13 highway, but I baby it.

 

[da_raabi]

1 ton crew dually with the 454/TH400/4.10s gets a whopping 6-7mpg city. Maybe 10 highway. I can squeeze 1-2 extra mpg out of it using ethanol free gas, maybe a bit more if I baby the crap out of it and stay waaaaay out of the secondaries. Oh and running Berryman's B-12 seems to make the gas last a bit longer too. But 6mpg is about my average.

One good stomp getting onto the freeway eats up every bit of fuel savings I may have had though... but its worth it!

 

[glockholiday]

88' Suburban, TBI 350, 700R4 trans, 3.54 gears and 33" tires 11-14 mpg.

 

[rich weyand]

78 Cheyenne 4x4 short bed, new 350 (Edelbrock carb, stump-puller cam, and headers), TH350, 3.73 gears, 31" BFGs -- 10 in town, 12 on the highway at 55, 10 on the highway at 75, with hubs FREE and xfer case in 2WD.