Why our cars get bad fuel milage

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Joined
Apr 2, 2021
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Calgary, Alberta, Canada, T2P 3R7
Well at least for the 7 winter months our gas mileage is great....i haven’t filled the tank since I parked the old girl for the winter, back in September...that said come April or May when I take it out again, she is a thirsty one...but as my memory is short, it will be a new issue later this year...
 
Joined
Sep 12, 2015
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Location
SW Ontario
My Car
1971 Mustang Mach 1, M code, 4 speed.
Well at least for the 7 winter months our gas mileage is great....i haven’t filled the tank since I parked the old girl for the winter, back in September...that said come April or May when I take it out again, she is a thirsty one...but as my memory is short, it will be a new issue later this year...
I'm in the same boat. The problem is will my pockets be deep enough to feed the beast. The greed continues..................
 
Joined
Aug 26, 2022
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Location
Lubbock,Tx
My Car
1971 Pewter Convertible 351-4V
H
I'm in the same boat. The problem is will my pockets be deep enough to feed the beast. The greed continues..................
Thank the good Lord, if I wanted good gas mileage I'd drive a Prius. Don't get me wrong, I am all about being green.... as long as it's Medium Green, Competition Green, Ivy Green, Dark Green, Ivy Glow, Medium Lime, Bright Lime, or Grabber Lime! :cool:
 
Joined
Dec 14, 2017
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Location
Erie, Pennsylvania
My Car
1972 Grabber Blue Mach One 351 Q code orig 4 speed. Now: 427C Titus, TKO 600, 4 wheel discs
Well at least for the 7 winter months our gas mileage is great....i haven’t filled the tank since I parked the old girl for the winter, back in September...that said come April or May when I take it out again, she is a thirsty one...but as my memory is short, it will be a new issue later this year...
You put yours away early RD (September)
 

351c1971

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Jul 3, 2022
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Location
Bayville ,NJ
My Car
1971 Mach1
At least the 73 and later 2v Cleveland heads have induction hardened valve seats to support unleaded regular. I keep a spare set of 74 heads in the attic, just in case.
 
Joined
Feb 20, 2013
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Location
Mobile, AL
My Car
'72 Convertible, Dark Green Metallic w/ White Top & Ginger Interior w/ 351 HO & 4 Speed
When I last drove it, my gas mileage was 10 in town and 12 on the highway. The best I ever got was 13. The worst was 4 when racing and I did that as often as possible. A set of tires lasted 4 months! So many good and expensive memories! Hopefully again in the not so distant future.
 
Joined
Jan 20, 2022
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Location
Homer Glen, Il
My Car
1971 Mustang Mach 1 351c FMX trans and 9 inch rear end
My car is not done yet but I'm confident my Mustang won't have the worst mileage of my cars. My big block Chevelle with 670 HP gets 4 MPG if I 'm not getting on it too much. If I get my foot into the throttle it quickly becomes a gallons per mile situation. My best is my new Rubicon and that only gets around 16, so the bar is set pretty low. Maybe I should start parking next to Tesla's and Prius's like Adrose come to think of it. My wife's car gets like 26 if that redeems my lack of greenness at all.
 
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Joined
Aug 12, 2019
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Tennessee
Somewhere I have a picture of my dad in his ‘71 Boss 351..Pulling a boat and trailer! and If that’s not bad enough, it was early spring in Michigan. He had SNOW TIRES on it! That should have cost about 5 mpg!
if I can find the pic I’ll post it. or maybe none of you could stand to see it. (lol)
 
Joined
May 19, 2021
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Location
Fort Mohave, AZ & So Cal
My Car
73 Grande will undergo three phase build process. Phase 1 is to make roadworthy. Phase 2 is interior/exterior restoration. Phase 3 is ++ performance.
I think “bad” get an unfair wrap. The SPG on my 73 has got to be 100 or more.



SPG = Smiles Per Gallon; it beats my Tesla by at least 50 on that scale. 😁
 
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