20inchaurora
Aurora Passenger
"not your father's oldsmobile"
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Post by 20inchaurora on Oct 2, 2005 21:45:50 GMT -6
just curious of what fellow owners of 2nd gen 4.0s get for gas mileage...im averaging 17.0 right now, with about 1/4 of the driving as highway driving...wondering how it compares to some of you guys
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Post by betonthis1 on Oct 2, 2005 22:52:05 GMT -6
not a 2nd gen owner but im getting 16.5 right now. everyone else that has a classic is getting a lot better so i need to do something to get mine to their levels.
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Post by TJM on Oct 3, 2005 6:02:50 GMT -6
not a 2nd gen owner but im getting 16.5 right now. everyone else that has a classic is getting a lot better so i need to do something to get mine to their levels. What size tire are you running? If oversized (taller)then the DIC will be way off. check here www.miata.net/garage/tirecalc.html to calculate the circumference of your tire compared with OEM. A larger (taller) tire will decrease torque but increase top end. This link will tell you how much your speedo is off with other-than-OEM tires. |
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Post by mission008 on Oct 3, 2005 6:16:34 GMT -6
My car is completely stock and I am averaging 19mpg, and I only drive through the city
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BNICOV
Aurora Lover
Posts: 782 
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Post by BNICOV on Oct 3, 2005 8:53:53 GMT -6
I average about 22mpg with mixed city/highway. Not too bad considering there's a fair bit of stop and go involved. On a highway run I get north of 26mpg cruising at around 75mph. A lighter foot helps with fuel economy. If you have a lead foot (I'm not mentioning any names here), DON'T expect to get decent mileage, be realistic.
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scottydl
Super Moderator 
There's nothin' like an American V-8...
Posts: 7,373
Staff Member
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Post by scottydl on Oct 3, 2005 9:09:19 GMT -6
Moved to the 2nd-gen 4.0 section, since that's specifically who the original question is directed to.  |
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Post by Aurora40 on Oct 3, 2005 15:39:56 GMT -6
I get about 20mpg on average.
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Post by Marc on Oct 3, 2005 16:57:05 GMT -6
My 2001 4.0 gets 25 - 26 mpg on the road. Taking it easy once (60 mph in a 50 zone) on level ground, I saw
it get 29, according to the DIC.
As for city driving, that depends a lot on traffic density.
It'll get anywhere between 13 & 17 then.
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20inchaurora
Aurora Passenger
"not your father's oldsmobile"
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Post by 20inchaurora on Oct 3, 2005 22:35:07 GMT -6
sorry scotty didnt mean to post it in the wrong place!
so basically the concensus is that 17 isnt terrible for mostly city? and also, how do you other 20 inch guys compare to stock 'roras? seems to bea bit less...interesting
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Post by kobalt on Oct 4, 2005 1:20:46 GMT -6
I would say 17 city quite good considering you got the 4liter and 20" rims. Try doing the calculations yourself and compare to the DIC: Fill up to full and reset your trip meter. When you need to get gas again fill up to full. To obtain mpg divide the miles indicated by the trip meter by the amount of gas purchased this time around. Compare your mpg to the DIC mpg output.
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20inchaurora
Aurora Passenger
"not your father's oldsmobile"
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Post by 20inchaurora on Oct 4, 2005 11:27:12 GMT -6
yea the DIC is right on with the actual mpg. got 255 miles on 15 gallons the last fill up, which is just shy of 17 mpg.
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Post by macadamiaman on Oct 4, 2005 16:39:34 GMT -6
Are you sure that's actual mileage though? With your 20" wheels it could have a big error rate over time...
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20inchaurora
Aurora Passenger
"not your father's oldsmobile"
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Post by 20inchaurora on Oct 4, 2005 16:55:26 GMT -6
i'm maintaining the overall rolling diameter within 0.2 of an inch...haven't done the math yet, but im sure the difference is negligable
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Post by Custom88 on Oct 4, 2005 18:04:28 GMT -6
this last tank of gas I drove 379 miles and used 12.2 gallons of gas. That works out to being 30.6 MPG average. Granted this is with the V6 and not the 4.0.  |
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Post by kbpickle on Oct 4, 2005 19:27:49 GMT -6
With 35 miles round trip each day to work, and errands on the weekend, I'm getting 20 - 21 mpg. My daily commute is about 60% highway (55 mph - 65 mph) and 40% city/suburban (0 - 45 mph). On an extended highway trip I can get ~24 mpg at varying speed limits. 2003 4.0 with 39,000 miles.
On a similar daily commute my wife gets ~24 mpg. On an extended highway trip she can get ~28 mpg. 2001 3.5 with 90,000 miles.
Both of us are conservative drivers.
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scottydl
Super Moderator
There's nothin' like an American V-8...
Posts: 7,373
Staff Member
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Post by scottydl on Oct 4, 2005 20:32:08 GMT -6
sorry scotty didnt mean to post it in the wrong place! Eh, no worries... it was really a toss-up as to where the topic belonged. so basically the concensus is that 17 isnt terrible for mostly city? That seems reasonable for any size V-8 IMO... mine sticks around 19 recently for 50/50 highway and city driving. |
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Post by gmfan on Oct 5, 2005 21:22:14 GMT -6
My '02 4.0 is averaging 21.5 for the first 1000 miles of owner ship. 75% highway and 25% small town stop and go.
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20inchaurora
Aurora Passenger
"not your father's oldsmobile"
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Post by 20inchaurora on Oct 5, 2005 22:00:06 GMT -6
well its comforting to know that im not alone here...sometimes i forget the fact that, like you said, it is a v8, regardless of how small it is! at least i dont have to worry about tuning it up yet anybody else see this ad at the top of the screen for this topic? lol what a joke! www.fuelteq.com/ |
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Post by betonthis1 on Oct 6, 2005 7:22:52 GMT -6
not a 2nd gen owner but im getting 16.5 right now. everyone else that has a classic is getting a lot better so i need to do something to get mine to their levels. What size tire are you running? If oversized (taller)then the DIC will be way off. check here www.miata.net/garage/tirecalc.html to calculate the circumference of your tire compared with OEM. A larger (taller) tire will decrease torque but increase top end. This link will tell you how much your speedo is off with other-than-OEM tires. wow, thats cool. my speedometer is reading 1.3% too fast. When my speedo reads 60mph, i'm actually traveling 59.2mph. not a big difference at all but i know my gas mileage reading might be a tad off. |
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Post by betonthis1 on Oct 6, 2005 7:26:55 GMT -6
oh i just used Javi's size of 255 35/20 and it changed from 1.3% to just 0.3%. wow, might have to get that size next when i have to get new tires.
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Post by TJM on Oct 6, 2005 7:54:45 GMT -6
I stumbled on that site about 7-8 years ago -- took me a loooong time to find it again. its great information made easy.
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20inchaurora
Aurora Passenger
"not your father's oldsmobile"
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Post by 20inchaurora on Oct 9, 2005 8:09:23 GMT -6
what are you runnin for tires now? 245/35?
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Post by kbpickle on Feb 21, 2006 19:48:37 GMT -6
I've got fuel economy results from a 10-day test on my 2003 4.0L.
a) First 5 days, 218 miles - to and from work, a mixture of limited access highway driving (55 mph - 65 mph) and in-town driving - - 21.4 mpg by my calculations, 21.3 mpg by DIC. 93 octane, 35 psig tire air pressure, Mobil 1 engine oil, K&N air filter. This is about what I get all the time during the work week, whether I'm running 93 octane, mid-grade, or 87 octane. Avg speed of 31 mph by my calcs, 32 mph by DIC.
b) 2-day highway trip from Raleigh, NC to Ft. Myers, FL, and part of the way back, 1108 miles - 25.1 mpg by my calcs and by DIC. 93 octane. Mostly I-95 & I-75, some Florida backroads. Avg speed of 56.8 mph by my calcs.
c) 2 days back, 520 miles - 25.7 mpg by my calcs and 25.9 mpg by DIC. 87 octane. Avg speed of 61 mph by my calcs, 62.1 mph by DIC.
d) Total test trip - 1846 miles, 74.5 gallons of fuel of two different octane ratings, 24.8 mpg average. Smooth, conservative driving, from speed limit to + 5 mph most of the time, no WOT. 40% driving by my wife who drives a little slower, but has more of a speed up-slow down style. I suspect we're about equal in fuel economy.
e) Conclusions - What interested me at the start of this test trip was to get a sense of whether or not in practice there was a difference in fuel economy between 93 octane and 87 octane. My preliminary conclusion based on this imperfect test is that there is no difference. Or, if there is any difference, it is masked by, and secondary to, the driving style, and to the mix of highway/in-town driving. Note that fuel economy did not follow perhaps the intuitive expectation that a lower average speed would yield a higher mpg.
Second conclusion - The DIC is close enough to my calcs to be taken at face value. I see just as much reason to suspect minor inaccuracies in the topping off of the gas tank (due to surging in the tank, or non-level position of the car while filling, or inaccurate delivery of the pump itself) as I do to suspect inaccuracy in the DIC.
f) Sighted 16 second generation Auroras and 10 Classics on the trip. Including one light blue Classic unoccupied on the side of the interstate.
g) We've gotten a round trip average of 28 mpg (87 octane) with the 2001 3.5L on essentially the same trip. Once or twice individual legs of those trips were up to 30 mpg under very good conditions.
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Post by PurpleSplat on Mar 6, 2006 11:42:52 GMT -6
Mine has been going down lately and I haven't changed my driving habits of late... it's gone from 12.1L/100km to 13.0L/100km. I'm going to clean the filter and throw in some fuel injector cleaner and see how that goes.... the tires are fine, so it's not that.
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Post by macadamiaman on Mar 6, 2006 14:57:47 GMT -6
(google.com)
12.1 L/100km = 19.4392218 miles per gallon
13.0 L/100km = 18.0934296 miles per gallon
Seems like all of us are going down...
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Post by flintoid on Mar 8, 2006 5:11:10 GMT -6
I've been averaging 21.7 to 21.9, average speed was 39 mph on the DIC though - this thing's been a bullet.
Anybody know the overall fuel range on the 4.0? I keep creeping up to about 320 miles between fills, suspect it's higher than that.
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Post by Wacko on Mar 8, 2006 8:16:51 GMT -6
I was close to 23 mpg average with an average speed of 31 mph in the fall. Now it has sunk down to 21.3. I hope the ~7.5% reduction is due to this so-called winter-blend gasoline. I don't think my driving style has changed that much. I don't know what the range should be however. |
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Post by Wacko on Mar 9, 2006 8:06:21 GMT -6
I read that blended gasoline (with ethanol) can affect mileage around 2%. Anyone read this?
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Post by Aurora5000 on Mar 9, 2006 9:58:27 GMT -6
19 mpg
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Post by flintoid on Mar 20, 2006 0:02:02 GMT -6
Eeentresting - just put a tank of regular in it and my mileage dropped about two gallons?
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