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| Fuel Mileage Poll https://www.slantsix.org/forum/viewtopic.php?t=46596 |
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| Author: | 73dart_swinger [ Sun Oct 09, 2011 10:25 am ] |
| Post subject: | Fuel Mileage Poll |
What kind of fuel mileage is everyone getting from their slants? |
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| Author: | 73dart_swinger [ Sun Oct 09, 2011 10:51 am ] |
| Post subject: | |
Might be interesting to mention a little about your set up, carb, cam, gearing, distributor work, vehicle, etc. |
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| Author: | 805moparkid [ Sun Oct 09, 2011 2:00 pm ] |
| Post subject: | |
i get about 20mpg out on the road... 225 bored .080 heavily ported head (10:1 comp) .475 lift / 246 2 50 cam headers,clifford intake, 600dp holley 3500 stall converter 8.75 with 3.91 sure grip, 28" tall tires cruize at 63mph @ 3100 depending on the hills |
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| Author: | Aggressive Ted [ Sun Oct 09, 2011 2:06 pm ] |
| Post subject: | Fuel mileage |
I posted the lowest I get (22 - 22.9) due to all the local driving I have been doing. Mostly short hops of 4 to 8 miles and an occasional 16 miles run with no freeway driving. Currently I am running a bone stock 1979 engine that had been sitting in a barn for 10 years which was covered in hay missing the carb, fuel pump, distributor and dipstick for $125. I installed it as is, filled it with Mobile 1 0-30W synthetic oil and have been driving it the last few years while my good 9.5 to 1 engine gets some upgrades. As far as set ups I run the SL6 hot. 195 degree stat and a stock 18" wide radiator with a 16 pound cap. Quick warm ups are a must. The intake must warm up quickly and stay warm. I do not run a stock fan which blows on the intake constantly. Instead I run two electric fans which rarely turn on unless I am in traffic. The second item is the heat deflector which also keeps the intake manifold warm. I was lucky to find a Holley 1920 Economaster from a taxicab which atomizes much better at low rpms. I also run a very fast distributor curve which makes the SL6 feel like there is more power. It stops at about 52 degrees advance. To keep it from pinging I run colder UR4 NGK plugs. As a result I don't have to push it very hard since it is so punchy and peppy. My car is a 74 Dart Swinger (heavy 3300 lbs.) with a 2.76 ratio 8 3/4 Sure-grip. The exhaust is mostly 2.5" running a Flowmaster 70. At the manifold it starts out at 2.25" for a few feet then steps up to 2.5". Tires are 26" tall Toyo Eclipse P215 70R series. Transmission gear in the 904 is a 28 tooth. Cruise at 50 mph is 2000 to 2200 rpm, 2500 at 60 mph. |
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| Author: | nuttyprof [ Sun Oct 09, 2011 6:13 pm ] |
| Post subject: | |
18.3 mpg, 62 valiant, 170, was parked for 22 years, haven't done a tune up yet. |
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| Author: | wjajr [ Mon Oct 10, 2011 5:33 am ] |
| Post subject: | |
225 ci, 0.030†over, compression 9.5:1, 3-8†vacuum at 650 rpm. – 18†vacuum @ 4500 – 5500 rpm Cam of unknown manufacture; Exh. & Int. .480†lift at valve – tappet lift .236†at 0.050†overlap @ 0.050†20* as measured from degree wheel. Peanut Head; ported, 1.44†– 1.70†valves, shaved 0.075â€, Clifford intake & headers, 2†duel exhausts to bumper. Holley 390; 57 jet, 2.5 PV, Acl. Pump #25 nozzle- orange - #2 hole, brown secondary spring. . 904, V8 rated stall @ 2600 rpm 3.55:1 8 ¾†Suregrip, P205/70R-14 Gutless below 3000 rpm. Pulls like a MF above 4500. She's a former Drag Queen... 17 mpg |
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| Author: | Old Car Scott [ Mon Oct 10, 2011 9:22 am ] |
| Post subject: | |
I just checked this out Friday when I made a bomber mission to and from Sacramento. 1967 Plymouth Valiant two-door 225 2 bbl / 4 speed / 3.23 8 1/4 I got 22.xx MPG turning 3200 rpm pretty much the whole way!  Need to get an overdrive into this thing and fix the seeping gas tank and it should go up more!! 
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| Author: | lincparts [ Mon Oct 10, 2011 9:47 am ] |
| Post subject: | 63 valiant wagon |
I get 20 mpg city and 23 freeway ( fast in California) with my super six setup,ei, re-curved dizzy and 2 1/4" exhaust in my 63 wagon. |
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| Author: | ceej [ Mon Oct 10, 2011 10:03 am ] |
| Post subject: | |
Made seven passes at Redding. Used 1-1/2" - 2" of 110 Purple out of the 8 gallon fuel cell. Not bad.  Out on the road it gets about 20 on a mix of premium and race gas. As long as I keep out of the thottle when pulling hills, I can run pump gas, but I'm not very good at keeping my foot out of it.  Not going to vote, cause I haven't done a quantitative mileage computation for a couple years. CJ |
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| Author: | Dart270 [ Tue Oct 11, 2011 11:41 am ] |
| Post subject: | |
22-26 hwy MPG on my fast Darts (64 is NA motor, mid 14s in 1/4, 68 is turbo, high 14s in 1/4 so far). Both are EFI with OD trannies (64 is 5spd, 68 is OD auto w/LU). Lou |
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| Author: | 73dart_swinger [ Sat Oct 15, 2011 12:28 pm ] |
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I have been driving my 73 Dart about 150 miles a day, 5 days a week for the last month. I averaged out my mileage and I'm getting right at 19 mpg. 225, super six Rebuilt with ported head Comp Cams 264 Headers, 2.25" single exhaust with a Flowmaster 40 Distributor recurve 2.76 Rear gears Rebuilt 904 |
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| Author: | Fopar [ Sat Oct 15, 2011 4:40 pm ] |
| Post subject: | |
My 63 Dart gets 19.44 on the freeway with 3.80's in the rear end and it did a 90.25 MPH in 14.95 sec at Redding (1/4 mile). Richard |
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| Author: | nichocli [ Sun Oct 16, 2011 9:16 am ] |
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I get on average 19mpg with my 80 dodge d150. It is a bone stock / with a833od, running 235 75 15 tires. average speed 50-60mph running e10 fuel |
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| Author: | Ross [ Sun Oct 16, 2011 1:58 pm ] |
| Post subject: | |
I didn't even vote cuz mine isn't up there. Checked it yesterday after putting 200 miles on my tank, avg, 12mpg. Only mods are a 2.5" exhaust and hei ignition. The throttle bushings leak though and I drive up a big hill every day to work. No OD either. I've gotten anywhere from 11-19 mpg in my truck depending on how well it's running. |
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| Author: | frank79912 [ Wed Oct 26, 2011 1:39 pm ] |
| Post subject: | Gas Mileage |
Since the speedometer and odometer is off by 20 % due to the replacement rear end- after correcting for the errors I get around 17.5 mpg in town driving around 30-40 mph and trips of 5-20 miles.Thats running 75w90 in the A 833,235/75r15 and mineral 10w30.Air temp between 45 and 70 Carter bbd from a 318 with the choke disconnected and a stock 74 electronic distributor at 6 degrees of timing and GM HEI .On the one and only road trip it got somewhere around 24 mpg in the lower portion of NM/west Texas in 100 degree heat. http://www.facebook.com/photo.php?fbid= ... =1&theater |
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