R50/53 Too good to be true!! 30 MPG after all the mods...
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I do mostly city type driving and I average 25-25.5mpg with 19% pulley, intake and UUC exhaust. Before mods in stock form???? I used to average 24mpg. The pulley made a HUGE difference in fuel efficiency. Before it just didn't breathe as well and was woefully underpowered. The exhaust, however, decreased my mileage a tad. I'm guessing it's b/c of all the burbling burning gas when I let up on the throttle.
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I have a 2003 MCS.
In stock form I got 29 mpg in mixed driving and at best 33 mpg with mostly highway driving at 60 mph.
After madness intake, 63 mm throttlebody, pulley upgrade, Milltek headeer/cat-back exhaust, light wheel/non runflat ultraperformance tire upgrade, big and heavy full audio upgrade, full springs/lower control arm upgrades, etc, I get.
Mixed driving 26 mpg
best highway about 29 mpg
All of this is by manually filling the gas and calculating fuel used vs miles on the odometer.
All numbers from the computer are off target- don't use them for this purpose.
So now some people report very good gains with the pulley upgrade but personally I have not seen it.
And others report mpg gains from mods such as Plasma Boosters to cylinder heads. Great but I did not see the gains from my plasma booster which I have since sold.
So what is going on. He is a theory. If there are any gains in efficiency with the pulley they are easily negated by the alteration in driving style of the owner after the mod. If you drive calmly and don't really hammer the throttle you might do fairly well. I don't think I am that bad and most of the time driving under 60-65 mph but I am still not seeing the higher mpg that others report after modding. So aggressive driving will lower mpg.
Part two- I think the wheels esp tires make a huge difference. Consider this.
Stock S-lyte 17" rims and stock 205/45-17 runflat tires are 48 pounds each.
My Centerline RPM 17" rims with non runflat 215/45-17 tires are 38 pounds each. Slighter larger contact patch.
My autocross wheels with 15" stock holies and Kumho Victoraceer V700 205/50-15 tires weigh 30 pounds each.
The stock holies with non runflat continental 175/65-15 tires were 26 pounds each but had a small contact patch and low low low rolling resistance.
So high vs low weight of wheel, large contact patch and aggressive driving style, high vs low rolling resistance and variable weight of our various mods probably alter the mpg data enough so that we have some variables not being controlled for and some latitude in our reported data.
Finally, proper tire inflation plays a major role in getting the best mpg. Also mpg will vary with the source of gasoline being used. Expect slightly higher mpg with better quality gas.
In stock form I got 29 mpg in mixed driving and at best 33 mpg with mostly highway driving at 60 mph.
After madness intake, 63 mm throttlebody, pulley upgrade, Milltek headeer/cat-back exhaust, light wheel/non runflat ultraperformance tire upgrade, big and heavy full audio upgrade, full springs/lower control arm upgrades, etc, I get.
Mixed driving 26 mpg
best highway about 29 mpg
All of this is by manually filling the gas and calculating fuel used vs miles on the odometer.
All numbers from the computer are off target- don't use them for this purpose.
So now some people report very good gains with the pulley upgrade but personally I have not seen it.
And others report mpg gains from mods such as Plasma Boosters to cylinder heads. Great but I did not see the gains from my plasma booster which I have since sold.
So what is going on. He is a theory. If there are any gains in efficiency with the pulley they are easily negated by the alteration in driving style of the owner after the mod. If you drive calmly and don't really hammer the throttle you might do fairly well. I don't think I am that bad and most of the time driving under 60-65 mph but I am still not seeing the higher mpg that others report after modding. So aggressive driving will lower mpg.
Part two- I think the wheels esp tires make a huge difference. Consider this.
Stock S-lyte 17" rims and stock 205/45-17 runflat tires are 48 pounds each.
My Centerline RPM 17" rims with non runflat 215/45-17 tires are 38 pounds each. Slighter larger contact patch.
My autocross wheels with 15" stock holies and Kumho Victoraceer V700 205/50-15 tires weigh 30 pounds each.
The stock holies with non runflat continental 175/65-15 tires were 26 pounds each but had a small contact patch and low low low rolling resistance.
So high vs low weight of wheel, large contact patch and aggressive driving style, high vs low rolling resistance and variable weight of our various mods probably alter the mpg data enough so that we have some variables not being controlled for and some latitude in our reported data.
Finally, proper tire inflation plays a major role in getting the best mpg. Also mpg will vary with the source of gasoline being used. Expect slightly higher mpg with better quality gas.
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Alta 15% pulley, UNIChip, Unifilter, Magnaflow exhaust, Denso Iridium Spark plugs (colder IK22), Kingsbourne 9mm wires.
My mpg went up about 1 mpg on the freeway. In mixed driving I've always managed to get between 26-28 mpg. I've never seen more than 35 mpg on the freeway.
It's hard making good mileage on the local jaunts as my foot gets too heavy.
My mpg went up about 1 mpg on the freeway. In mixed driving I've always managed to get between 26-28 mpg. I've never seen more than 35 mpg on the freeway.
It's hard making good mileage on the local jaunts as my foot gets too heavy.
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With my JCW + K&N drop-in, the best I have averaged has been 30mpg on a long-distance trip. I did 345 miles and the OBD range said around 40 miles left on the tank. This was all highway driving but normally with roughly a 75/25 mix of highway/city "somewhat spirited" driving I average around 24mpg or so.
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'03 Cooper S JCW Pure Silver/Black - PP, CWP, Space Cloth, Fogs, 16" R90s, K&N, 35% tint
'02 S2000 Spa Yellow/Black - HKS exhaust, OEM hardtop, Infinity rears
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'03 Cooper S JCW Pure Silver/Black - PP, CWP, Space Cloth, Fogs, 16" R90s, K&N, 35% tint
'02 S2000 Spa Yellow/Black - HKS exhaust, OEM hardtop, Infinity rears
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11,000 trouble free miles, and averaged 30 mpg on last tank with 1/2 freeway at 75-80 mph, half spirited driving! VERY happy with current mpg... I have added the following performance mods;
-Magnaflow exhaust
-Pilo Racing cold air intake
Pilo
Magnaflow
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2004 MCS - PW/B w/Xenons
-Magnaflow exhaust
-Pilo Racing cold air intake
Pilo
Magnaflow
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2004 MCS - PW/B w/Xenons
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The Dragon Run seems to have done some good for my car. On the way down, The OBC indicated we were getting about 34MPG, doing ~70MPH (due to heavy traffic enforcement on the I-81 corridor in southwestern VA) in dry weather.
On the way back, in mostly rainy weather, we were doing 80-85 on average to keep from being mowed over by SUVs and tractor-trailers, and the OBC read 36.1 MPG. Even pushing aside the water with the tires, and travelling faster, the car did markedly better. Maybe the car likes non-oxygenated fuel better; the pumps in NC and TN did not have the "Oxygenated fuel" notice decals all over them that those in the DC metro area do.
On the other hand, the car did get its first non-stock add ons during the trip- a pair of dragon decals and a NAM decal. Maybe the "import tunerz" are onto something after all! If Mark could do a few decals in yellow to maximize their potency, and send'em to Andy for testing, we could find out for certain!
On the way back, in mostly rainy weather, we were doing 80-85 on average to keep from being mowed over by SUVs and tractor-trailers, and the OBC read 36.1 MPG. Even pushing aside the water with the tires, and travelling faster, the car did markedly better. Maybe the car likes non-oxygenated fuel better; the pumps in NC and TN did not have the "Oxygenated fuel" notice decals all over them that those in the DC metro area do.
On the other hand, the car did get its first non-stock add ons during the trip- a pair of dragon decals and a NAM decal. Maybe the "import tunerz" are onto something after all! If Mark could do a few decals in yellow to maximize their potency, and send'em to Andy for testing, we could find out for certain!
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Luckily, we'll almost always get great gas mileage when cruising on the highway, the slower the (much) better. As long as you don't get into boost and are smooth, the little engine is sippin its drink. If you're driving around at speeds higher than 80-85mph though, the tables turn real quick.
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