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Old 12-18-2020, 10:49pm   #1
Grey Ghost
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Default 5-6 MPG

My 1974 C10.

350 with automatic. No overdrive. I think a 3-spd TH350? I'll have to find the rear axle ratio...maybe 3:55/3:73.

I STILL thought I would average 10 or so mpg. I ran completely out of gas today. It took 16 gallons and averaging what I drove it last week is how I came up with the 5-6 mpg.

Would no overdrive and that kind of gear ratio = those numbers? Would it take a 3:23 or so rear to get 10mpg? I think the lack of a overdrive is what's killing the mpg?

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Old 12-18-2020, 10:54pm   #2
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My Mustang gets 8mpg.

3.55 with a six speed.

Right foot controls mileage.
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Old 12-18-2020, 11:10pm   #3
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Drive into the lake or to a democrat run town. That mileage demands you take final action.
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Old 12-18-2020, 11:27pm   #4
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Unless you have a really steep gear which you'd notice you may have a leak. I've driven those for decades and never had that bad of mileage unless a BB 4x4 3/4 ton.
I drove the shit out of last one, had 373 gears and wasn't nice to it still got 12 to 15.
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Old 12-18-2020, 11:28pm   #5
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My 77 gets into the single numbers with the same 350/350 combo.
My full size truck can get about 20 mpg on the highway has the 5.3 6spd auto with 3:42 gearing rolling on twenty's.
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Old 12-19-2020, 12:05am   #6
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Our C6 Z had the instant mileage in the gauge, it was a challenge to see how low i could get it. Had it down to 2 MPG A couple times
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Old 12-19-2020, 1:11am   #7
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Quote:
Originally Posted by z06psi View Post
My Mustang gets 8mpg.
And you're bragging about that?
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Old 12-19-2020, 5:02am   #8
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that is what my old beater 74 ford gets. I still love putting around close by with it.
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Old 12-19-2020, 7:45am   #9
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Those old Chevys are cool AF. Itís not your daily I assume so who cares what it gets.
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Old 12-19-2020, 7:56am   #10
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Quote:
Originally Posted by dvarapala View Post
And you're bragging about that?
The 900hp is the actual cause and my right foot is the variabe.
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Old 12-19-2020, 7:56am   #11
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Quote:
Originally Posted by Thomas View Post
Those old Chevys are cool AF. Itís not your daily I assume so who cares what it gets.
Perxactly.
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Old 12-19-2020, 8:12am   #12
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My '70 big block vette gets about 10 mpg around town, about 14 on the highway. It sounds to me like there is something wrong with your truck.
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Old 12-19-2020, 8:13am   #13
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Quote:
Originally Posted by Mick View Post
My '70 big block vette gets about 10 mpg around town, about 14 on the highway. It sounds to me like there is something wrong with your truck.
That's about what I was getting with my '74 454 coupe.
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Old 12-19-2020, 8:27am   #14
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I did a lot of both street and drag strip running. Back in the 60s I had a highly modified 67 Dodge RT 440CI auto trans.

Among the many mods were a rear end ratio of 4.33 and a Holly 3 barrel carburetor on a Eldebrock high rise manifold and a Mopar experimental cam.. That car did not get mileage it got yardage.

When it was stock it got like 12 highway and 9 in the city if you did not push it too hard. When modified like above it got about 8 on the highway and 4 in the city. Step on it and it got about 1 in the city.

Car was quite fast but even though I worked construction the gas cost was killing me I finely put in a 3.91 rear end and a Holly 3310 carb and it stayed that way for the next two years I owned it. Got married in 1970 and had to get a different car.
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Old 12-19-2020, 10:16am   #15
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Ram 2500 4x4 with Cummins Turbo Diesel..... city/highway avg is about 24mpg. Straight highway trips I get closer to 27-28.
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Old 12-19-2020, 10:19am   #16
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Quote:
Originally Posted by DJ_Critterus View Post
Ram 2500 4x4 with Cummins Turbo Diesel..... city/highway avg is about 24mpg. Straight highway trips I get closer to 27-28.
thanks
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Old 12-19-2020, 10:44am   #17
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5 or 6mpg is indicating a problem...have you checked vacuum or rebuilt the carb yet?

The cure is better heads, 3.03 gears in diff. (if not already there).

If you want even better:
aluminum intake
carb spacer (for heat dissipation)
better cam
better lifters
2.02 heads
4 speed auto trans
3.03 gears in diff. (if not already there)
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Old 12-19-2020, 11:06am   #18
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My '90 Chevy dually with a 454 gets 10.5 mpg city, highway, bed empty or loaded and/or pulling a trailer.
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Old 12-19-2020, 12:37pm   #19
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Quote:
Originally Posted by Raazor View Post
thanks
No problem. I'm only here to provide nothing of value.
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Old 12-19-2020, 1:06pm   #20
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Quote:
Originally Posted by Strats-N-Vettes View Post
5 or 6mpg is indicating a problem...have you checked vacuum or rebuilt the carb yet?

The cure is better heads, 3.03 gears in diff. (if not already there).

If you want even better:
aluminum intake
carb spacer (for heat dissipation)
better cam
better lifters
2.02 heads
4 speed auto trans
3.03 gears in diff. (if not already there)
So important, he typed it twice.

I'm pretty sure my 'vette has 3.08 gears out back. That should give better mileage than 3.55, but nowhere near double the mileage.
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