Can't believe this gas mileage

[Ron Sebastian]

Just started to keep track of mileage, I thought it was my imagination as the gauge was not moving, after driving 152 miles, now it's at 1/2 tank (left side saddle tank). I'm getting over 19 miles per gallon driving around town. Will prove tomorrow when I get gas to see if I'm really at half a tank. Saddle tanks are 16 gallons each, right? Can't believe fixing the intake manifold leak would equal better gas mileage.

 

[eskimomann209]

Just started to keep track of mileage, I thought it was my imagination as the gauge was not moving, after driving 152 miles, now it's at 1/2 tank (left side saddle tank). I'm getting over 19 miles per gallon driving around town. Will prove tomorrow when I get gas to see if I'm really at half a tank. Saddle tanks are 16 gallons each, right? Can't believe fixing the intake manifold leak would equal better gas mileage.

If you have a long bed it can be a 20 gallon tank

 

[Dmack]

Hope is a good thing, but I would be surprised at those numbers. Never trust the gauge. You need to fill the tank, drive for a while, top the tank back off, then divide the miles traveled by gallons used.

 

[Rusty Nail]

Ahhh! Yep I bet he gots longbed tanks!!
Do tell!

 

[AuroraGirl]

I thought longbed was 18, at least I recall when I purchased mine. The saddle tank that I got for half off because it was returned to amazon with a small dent in the crimping around the corner near the level sender. That was a good deal.

 

[ali_c20]

I have a long bed c20 (74) with 2 20ies and I wouldn't get that mileage even if i would calculate it with double 12 gallon tanks

 

[HotRodPC]

I have seen long beds with 16 gallons also. Shortbeds will always be 16, but there are at least a few longbeds with 16. Just don't be upset when you finalize your test and it's not 19. Be thrilled if it's 15 or better. Most of us are getting 10-13 in 4x4's but you do have TBI right? That'll help get it up a bit.

 

[Ron Sebastian]

Not quite what I thought but still pretty good. The truck has 16 gal tanks just to assure everyone. Drove 172.5 miles, gauge read just under half a tank see pic. Fueled up and pump read 9.928 gallons, so I'm thinking gauge is pretty accurate. 17.375 MPG is what I come up with.

You must be registered for see images attach

You must be registered for see images attach

 

[GXPWeasel]

That's better than I can get with my '15 Silverado this time of year!
during the summer months, sure..

However, I do suffer from a good sounding exhaust, and 2 daughters who are constantly asking me to drive faster.

 

[eskimomann209]

At or around 1/2 a tank plus 9.928 gallons... I’m not math magician.... but 1/2 plus 10 is 20. No?

 

[Rusty Nail]

Lmao

Good job ! @Ron Sebastian

It's concurred that many seem to avg. 10-13 from a 4x4.
I got 14.4 from my '75 with a Quadrajet and #416s on it.

 

[gotyourgoat]

Not quite what I thought but still pretty good. The truck has 16 gal tanks just to assure everyone. Drove 172.5 miles, gauge read just under half a tank see pic. Fueled up and pump read 9.928 gallons, so I'm thinking gauge is pretty accurate. 17.375 MPG is what I come up with.

You must be registered for see images attach

You must be registered for see images attach

Haha, welcome to food bag.

 

[Ron Sebastian]

Stay with me, I'm not a math major. 16 gallon tank, each quarter is 4 gallons. Half a tank 8 gallons. Just past half give or take the width of the Needle, I'm good with almost 10 gallons.

 

[eskimomann209]

Except the 4 gallon mark is each quarter so to get 10 gallons in the tank you need to be closer to the 1/4 mark. I drive mine daily to get 10 gallons in, I’m closer to the 1/4. To get 13 gallons in, I’m scary close to the empty mark.

 

[Overland Suburban]

Sweet! I had a 1974 4x4 with a 350. I got 17 mpg with it tuned up. Now I'm trying to figure out how I'm going to get a Suburban to get some mileage. Going to build a mild tuned up 350 first. Than going to go about building a 383 stroker. My guess is torque will win out in the economy department with a vehicle that heavy.

Some people might ask why would you build TWO engines. Because this **** is ******* fun and I can!