79 k20 5.5 mpg

[Wadell]

Hopefully someone can help me I have a 1979k20 truck stock 350 4 speed im getting 5.5 miles per gallon . Is this normal for this truck or is something wrong

[bd]

The simple answer is that 5.5 MPG seems low.  However, driving style has a HUGH impact on fuel mileage as does maintenance history, gearing, state of tune, condition of the fuel system, the environment in which the vehicle is used (flatland vs hilly terrain), tire size and pressure, vehicle load, the time spent idling the engine vs stop-n-go vs highway usage, and the quality of fuel.  So, the answer to your question is a resounding, "could be normal... could be something wrong..."

[JohnnyPopper]

Copy that on tire PSI...35 might be a more comfortable ride but it cost you biggly.

I take mine to just under the limit cold.

How many miles are on the motor? If you don't know, I would do a compression test first thing, or while you're doing a tune up.

It can and will tell the tale of your engine condition.

I only touched two of bd's scope, there's a lot more to go.

[Big Dee]

The brakes might be dragging. lift the front and spin the tire. friction will increase m.p.g.
bd is right in everything written, so pay close attention to that wisdom.

[Jimbo302]

For reference, my 77 C20 2wd, 350/th350, 4.10 rear, 31" tires, got 14mpg on the last tank .

[Wadell]

Thank yall for the wisdom I will look at all of the ideas

[Shifty]

87 V20 TBI350/400 4.11 gear w/33's, I get 10 smiles/gallon.