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  #1  
Old 05-01-2010, 03:53 PM
dungbeetle07 dungbeetle07 is offline
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Default MPG/Tuning?

Current tire size: 215/70R15

Stock tire size per door sticker: 195/70R14

Truck is new to me, fuel gauge is inop. It's a 90 reg cab 2WD, 5 Spd Man, with what I think is a 3.14 rear end. The axle code is 82 but that isn't listed in my owner's man. I checked MPG and came up with 19.5 which seems way low for that set-up. I realize my speedometer is not correct, I'm going faster than indicated. I should be getting a better MPG figure, and I'm trying to figure out what it actually is. This will help me figure out what (if anything) I need to work on for tuning/repairs. It doesn't seem to miss or have any other obvious problems. Haven't completed a compression ck yet, still scratching my head over the 8 spark plugs on a 4 cyl. I guess I should unplug both coil packs while I'm doing the comp ck. Vacuum @ idle is steady at 19'.
I did some math and figured I'm getting 21.06 actual but that seems way low also. I divided new tire diameter by original diameter (which = 1.08) and multiplied by 19.5.
If this should be in another topic area let me know.
Thanks
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Old 05-01-2010, 03:57 PM
dungbeetle07 dungbeetle07 is offline
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Default Re: MPG/Tuning?

On this site figured axle code 82 is a 3.08 open.
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Old 05-03-2010, 10:52 PM
Built Ford Tough Built Ford Tough is offline
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Default Re: MPG/Tuning?

The tires sound small lol? I get approx 23-30 with my 2.5l depending on what mood I'm in lol
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Old 05-05-2010, 02:42 PM
dungbeetle07 dungbeetle07 is offline
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Default Re: MPG/Tuning?

Yea, I'd hate to see the 14's on it. I did a cranking comp check and got appx 180 in all four. That with the vacuum ck makes me think it's not eng related, but I'm still uncertain. I did get the tires up to 38psi and that seemed to help, however I'm still at around 23 mpg which still seems low for a small 4 cyl with a 3.08 rear. Maybe it's not so low.
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90 Reg Cab 2WD 4Cyl
If it won't come off, put your head underneath it.
If it won't go together, put your thumb in between it.
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Old 05-05-2010, 07:13 PM
sgtsandman sgtsandman is offline
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Default Re: MPG/Tuning?

23 isn't bad for a truck. I get around that with mine. I am hauling around a fiberglass "high boy" cap though. The weight and drag does present a bit of a penalty...
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2011 Ranger XLT, 4X4, 4 door Super Cab. 4.0L, 5 Speed M50D-R1HD, 3.73:1, 8.8" open differential, Jason Pace cap
1999 Honda CR-V EX, RT4WD, 2.0L, 5 Speed MT, 4.56:1, open differential
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Old 05-10-2010, 08:57 AM
dungbeetle07 dungbeetle07 is offline
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Default Re: MPG/Tuning?

Thanks SGT. I've been looking around this site and had seen some figures just below 30mph which made me wonder. I know tire pressure and technique has a lot to do with it as well, plus my drive is mixed city/highway. Since it is new to me, I need to make sure the diff. has good oil in it. I'll probably go with a synthetic, which is a whole different subject.
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If it won't come off, put your head underneath it.
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Old 05-10-2010, 09:37 AM
sgtsandman sgtsandman is offline
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Default Re: MPG/Tuning?

Yeah, mine driving is pretty much 50/50 too. I haven't done any long trips yet to get a good idea what the highway mileage is. Being that it doesn't have cruise, not sure I would want to. LOL My CR-V is much better equipped for such excursions though it doesn't do much better, about 26-27 highway and 24-25 mixed.
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2011 Ranger XLT, 4X4, 4 door Super Cab. 4.0L, 5 Speed M50D-R1HD, 3.73:1, 8.8" open differential, Jason Pace cap
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