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What mileage do you get in your rod?!?

Discussion in 'The Hokey Ass Message Board' started by Johnny1290, May 28, 2008.

  1. My previous set up with it's 427 BBC 10.45:1 compression and an ISKY hydraulic roller 275-284, Brodix BBO heads and a Wieand Stealth dual plane, Demon 750 with electric choke, Tremec TKO five speed and a set of 3.5:1 rear gears on a 25" tall tire netted me around 12-14 MPG in town or out on the higway.

    I was also using about a gallon of water from the cooling system a week! Hence the rebuild.

    Now, 427 BBC (all new short block) with the same cam and heads but now feature a bit of port work. 8.5:1 compression with ceramic coatings on the flat top pistons and low friction coatings on the skirts. Accel-DFI SuperRam fuel injection that looks like a tunnel ram. A pair of Master Power T-70 turbochargers and custom built headers with flow kept in mind.

    I have nearly doubled my rear wheel horse power and now have gotten 18-20 MPG rated off my first three fillups. I have to get the truck back in for a final tune now that I have the engine broken in. I expect to pick up a ton of low speed drivability and maybe a point or two in MPG.

    I currently get better gas mileage than my 2003 2500HD Silverado single cab long bed pickup that is stock except for a K&N air filter and synthetic oil.
  2. beatnik
    Joined: Nov 8, 2002
    Posts: 2,207


    1926 T-Roadster, about 2300 lbs with me and a passenger in it. Stock 302 HO, with a Holley 600, C4 Trans, 8.8 rear end with 2.73 gear and a 31" Tire.

    It got 16 city, and 22 mpg highway driving 65-70 mph on 87 octane.

    Same car with a bigger camshaft, 3.55 gear, and a 28" tire and gets 18 mpg highway on 87 octane and it's spinning 1000 rpm more at higway speeds than it did with my old setup.

    I dont' know what it's getting in the city now.

  3. cwatson1953
    Joined: Nov 7, 2006
    Posts: 972


    what kind of vehicle? weight? etc?
    i've got a 292 L6 with a 500 cfm carter and a TH350...i keep thinking i need to swap out for an OD,...but it hasn't seen the road yet..

    just curious...
  4. TagMan
    Joined: Dec 12, 2002
    Posts: 6,176


    I'm kinda anal about keeping records and I have a small note book in all my cars. I got 15.6 mpg with the 401 (dual quads, 4-speed) in my '55 Buick Special going to the Hot Rod Reunion in Bowling Green two years ago - 725 miles each way at 65 - 75 mph.

    My '37 Chevy coupe (235 - 3-spped w/ OD) got 23.3 mpg going to Rapid City, SD in '06. 3600 mile round trip at pretty close to 65mph out & back.
  5. chopnchaneled
    Joined: Oct 21, 2004
    Posts: 1,419

    from Buford Ga.

    So far my 47 ford c-dan delivery has been just un real, i've had it for right at a year
    and it hasn't burned one drop of gas, guess if i'd get off my lazy ass and get a little closer
    to it with some tools i could change that.
  6. Drove the 51 Merc from Indy to Beatersville and back and averaged 21.2 MPG. Ran between 65-75 all the way there and back.

    Stock flathead with twin 94's, 3 spd with no overdrive and a late model Econline rear end. I assume the gear ratio to be in the low 3's.
  7. stude_trucks
    Joined: Sep 13, 2007
    Posts: 4,755


    somewhere around really bad to worse than that
  8. Hellfish
    Joined: Jun 19, 2002
    Posts: 6,482


    59 Chevy Bel Air with a '78 350/350 with an Edelbrock Performer manifold and Carb (600cfm, I think), rams horn manifolds, dual exhaust, 3.36(?) rear gears. I get about 16mpg on the highway
  9. 49ratfink
    Joined: Feb 8, 2004
    Posts: 18,114

    from California

    38 replies... I'd bet 5 of these cars have no speedo and another 10 have an innaccurate one.

    my buddy says he gets 22 MPG in his 48 Chevy. no speedo. said he used the mile markers on the side of the road. MPG is a mathmatical formula, not a guess.

    my slant 6 dodge dart got 15/16 city-hiway combined. my last 49 chevy said I was doing 90 when I was doing 70... I have no idea what the MPG was.
  10. Kind of a cynical post don't you think?

    MPG varies, fact of life man. And you can get reasonable estimates of fuel mileage by distance traveled vs fuel consumed, even if you are just counting mile markers. It's not a contest.
  11. Vorhese
    Joined: May 26, 2004
    Posts: 766


    my bone stock 49 f1 with flathead v8 gets about 6 mpg city and 12 highway. I'm getting a Pertronix and hoping that helps.

    My odometer doesnt work but I know how far I've gone, so it's an educated reasonable guess.
  12. LongT
    Joined: May 11, 2005
    Posts: 963


    T-bucket, 355/390 hp SBC, 4150 Holley, TH-350, 2500 stall converter, 3.00 rear, MT Sportsman - 12 city, 16 highway (65 mph about 2100 rpm if the tach is correct).
  13. wayfarer
    Joined: Oct 17, 2003
    Posts: 1,790


    '49 Dodge Wayfarer sedan, 440/727 3:50 ford 9". Gets 12 MPG pretty much no matter what. My dad pulls a trailer with it occasionally and it gets the same for them as when my wife and I have it on the highway without one. It's getting a gear vendors OD unit this summer, which will help.
  14. JohnEvans
    Joined: Apr 13, 2008
    Posts: 4,883

    from Phoenix AZ

    27 T 1800lb 153 Chevy II with 2 Carter 1 bbls 350/350 cam profile.T 50 5 speed O/D. 15-16 around town , loves RPM use 4000 shift points first 3 gears. 4.11 rear low 3s in OD. 2700 at 75MPH 28+ tires.
    65 Falcon Ranchero 200 six 3 on tree 3.5 rear 16-17 around town, maybe 20 on the road . Tend to run 75 on the freeway ,got to around here or ya get run over.
  15. GassersGarage
    Joined: Jul 1, 2007
    Posts: 4,727


    65' Biscayne 2 dr sedan. 454, .60 over, 10.5:1 compression, Merlin Oval port heads, Extreme Energy 278 cam and dual quads. Richmond 6 speed and 3:42 gears. Around town, I rarely get out of 4th gear. Mileage was 7-10. Took a 300 mile trip using 6th gear. Mileage was around 16. Dual quads run 1:1, not progressive.
  16. rodncustom
    Joined: Sep 24, 2007
    Posts: 1,317


    I have not yet calculated the mileage as I just got the car home and have only put 100 miles or so on it but on the freeway at ~70 MPH I'm turning 1,900ish RPM so I'm guessing that my freeway mileage should be pretty good.

    With a quickchange, though, I can make it whatever I want:D
  17. TagMan
    Joined: Dec 12, 2002
    Posts: 6,176


    "38 replies... I'd bet 5 of these cars have no speedo and another 10 have an innaccurate one."

    Any facts to back that statement up ???? :D
  18. When I went on the Deuce Run in my 32 pickup,,,I figured my mileage and the amount of gas used,,,I'm getting 14 MPG. HRP
  19. SlowandLow63
    Joined: Sep 18, 2004
    Posts: 5,953

    from Central NJ

    I just mapquested my distance to work, 15 mi. I put 10 gallons in it at the end of the week on average depending on how heavy my foot is. You do the math.

    Fact is you don't need an accurate speedo or an OBD-II system that monitors fuel consumption, all you need is a pencil and some paper. And maybe a computer. :)

    BTW, I get around 15MPG on the average. Over the hill 289 with a fairly new top end. 600cfm Edlebrock, Petronix Ford HEI, duals, 3.73 in the rear.
  20. 63ChevyII
    Joined: Dec 9, 2005
    Posts: 559


    Is that 292 mostly stock? That's great mileage.
  21. Buzznut
    Joined: May 9, 2008
    Posts: 2,349


    I have a '68 Vette 327cid that was one of the 350hp variety. It has been rebuilt and is at 10.5:1cr with an M22 hooked up to a 3:2x? 10 bolt rearend and it gets about 11 mpg average. I'm recamming it, retiming it and installing thicker headgaskets to get the cr down to 9.75:1 or so and should get 18 to 20 mpg after I'm done... A lot can be done to improve mileage...this should all cost me no more than a weekend and around $200 or so.
  22. Boyd Who
    Joined: Nov 9, 2001
    Posts: 2,196

    Boyd Who

    My '27 Essex gave me 20-21 mpg (US) on it's first trip out on the highway, running a 225ci slant-6/auto. It's been in storage for 20 years so I assume it would improve a bit with a good tune-up.
  23. Minewithnoshine
    Joined: May 17, 2007
    Posts: 938


    327-340hp with a Comp Cams .501 lift cam, 10.5:1 comp, roller rockers, Edelbrock 600cfm, Pertronix ignition, Saginaw 4spd with a 3.90 9" rear end, I got 16-17mpg on my last trip to Tipp City about 80 miles from here even getting in it a few times, truck weighs about 2200lbs I'd guess.
  24. phat rat
    Joined: Mar 18, 2001
    Posts: 4,578

    phat rat

    41 Ford cpe, 3700#, crate 425hp 454HP, 3.42 rear, 700R4 trans. 55mph highway I've gotten 19.5mpg. Running 70-80 mph it runs from 17-19mpg depending on conditions and quality of the gas. Town driving I get into it to much and get down around 12mpg
  25. Would sure like to see a picture of that. I've considered tinning over some of the bottom of my Suburban to see if it would help.
  26. parksquijada
    Joined: Aug 6, 2008
    Posts: 316

    from norcal

    also on the way to bonneville we got 17 mpg in my 54 f100 panel. 429, rv cam, 650 cfm, glasspacks 3800 lbs, 3.90+ gear. too low but didnt have to downshift EVER.
    Last edited: Apr 11, 2009
  27. kustomkat
    Joined: Sep 4, 2006
    Posts: 554


    53 Ford, warmed over 312, 3spd o/d, 4:11 gear at 60-70mph = about 25 mpg with a light foot.
  28. 1928 Model A on Duece rails, 306 SB Ford 2 - 600 Holleys, Gear drive Edelbrock heads and Cam. 315 HP at the rear wheels. 2500 Stall, C4 3.25 gears. 2308 Lbs. 18MPG at 80 MPH.
  29. RAY With
    Joined: Mar 15, 2009
    Posts: 3,133

    RAY With

    Well I have a 302 in my 51 F100 truck with AOD and 350 gear.It's a 92 roller motor converted to 4bb Holly avenger 550 carb with air gap intake and gets 18 mpg town and Hwy and when I use FPC I get 21 on hiway at 70 and average 19 in town.
  30. 11.75:1 Small Block Ford, Dual Quads, Big Freakin Cam, Close Ratio Top Loader 4 Speed, 4.11 gears - Who the HELL cares what the MPG is!
    The smiles per mile are much more important

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