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TDI Fuel Economy Discussions about increasing the fuel economy of your TDI engine. Non TDI related postings will be moved or removed.

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Old April 18th, 2011, 19:01   #1
Turbospool
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Default 60 MPG back to back Thread Secrets Only

Alright guys ...... I realize summer weather is upon us..... and we'd like to know what it takes for you to manage 60 MPG back to back , tank to tank, NO INDIVIDUAL SMART TRIPS!
1. What exact year, car, and mods do you have in the car you manage this in.
2. What technic do you personally apply?
3. What State/locality , terrain , elevation, weather temps, etc., are you doing this in?
4. How do you measure your milage?

I know this is being done by a select few, and we'd like to learn from you pro's!

Anyone else feel more criteria questions should be added let er be known.
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Old April 19th, 2011, 17:04   #2
Lug_Nut
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Wow! that's a tough feat to accomplish. I'm out.
My closest is 1025.2 miles on 16.77 gallons (61.15 mpg) followed by 726.5 miles on 12.28 gallons (59.16 mpg).

I did have 573.4 miles on 8.57 gallons for 66.89 mpg.
I did a quick check of the accuracy with a brief 348.5 miles and 5.08 gallons (68.60 mpg) but that doesn't satisfy your full tank criteria.
The next full tank was 658.8 miles on 11.00 gallons for 59.89 mpg, again, not quite back to back 60's, and that partial fill in between spoils it.

And if your running average of nearly 56 mpg is true, you are more likely to make the 60+60. My lifetime average in that 1996 Passat was 52.5, well below yours.
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Old April 19th, 2011, 17:16   #3
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Oh,
1996 Passat sedan, I think I had a 1k ohm Evry mod on it at that time.
Moderately hard acceleration (no wheelspin) up to desired speed, then highest gear possible (1200 rpm in 5th and 35 mph) and no acceleration. Maintenance of momentum with minimal braking and slowing, and minimal acceleration.
Central Massachusetts, between 1200 ft and sea level, May 5th to May 12th and then August 6th to August 16th of 1999.
Mileage was from odometer (checked against 100 consecutive miles of interstate back in '97? or '98?) and dollars spent over price per gallon ($16.75 at $.999 a gallon is 16.76676 gallons).
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If the quantity of carbonic acid increases in geometric progression,
the augmentation of the temperature will increase nearly in arithmetic progression.

Svante Arrhenius 1896

Cogito ergo soy (I think, therefore: Biodiesel)
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Old April 19th, 2011, 17:51   #4
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I thought I was doing well at 47mpg in my bug. Wow how do you guys get that kind of mileage. For me to get 47 I have to set the cruise and run 65mpg on flat interstate for extended periods.
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Old April 19th, 2011, 18:04   #5
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I got 905 miles, 930 miles, then 1000 miles on three consecutive tanks. But the 1000 mile tank was "only" 59.8 mpg, so I didn't even get into the 60 mpg club.

No mods on my wagon other than T4 nozzles. On the 1000 mile tank I was more or less keeping revs to 2000 max, with mostly highway driving.

Just filled tonight the first tank after the 1000 mile tank, where I digressed to more like 70 mph driving. 870 miles, 53.0 mpg.
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Old April 19th, 2011, 19:10   #6
ryan74701
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i was getting 58-62 mpg driving 75 miles from durant, ok to mcalester, ok with a 30 mph tail wind

2011 4 door golf tdi
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Old April 19th, 2011, 19:13   #7
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I must be doing something wrong. Best tank I ever got was 48mpg.
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Old April 19th, 2011, 20:56   #8
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best i ever got 44mpg. 02 jetta 5 speed
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Old April 19th, 2011, 23:41   #9
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60mpg... not going to happen with my model under normal driving condition.
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Old April 20th, 2011, 07:53   #10
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Quote:
Originally Posted by fastalan View Post
60mpg... not going to happen with my model under normal driving condition.
Mine either, but I'm about to get 47mpg back to back tanks on my automatic Beetle. Maybe if (or when ) I do a 5 speed conversion I can get closer to 60mpg.
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Old April 20th, 2011, 08:02   #11
hip001
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My 01 Beetle got 58mpg when i used the "pulse n glide" technique, drove slow with AC off and windows up, not exceeding 2000 rpm's. But I also have not made the 60mpg club. I think if i drive the 96 Passat this way I'd have a shot at it.
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Old April 20th, 2011, 09:35   #12
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The Golf averages in the mid 50's. It is an ALH '02 and it's a perfect commute. 60mpg? Won't happen unless I spend for a higher gear, and that won't happen either.
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Old April 20th, 2011, 12:39   #13
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I don't think I really qualify. I did get a few 60mpgUS tanks in the Passat when I was doing engine-off P&G, but I don't use that technique any more (it destroyed my clutch). Excluding that technique, I'd say that 56-58mpg or so was the best I could get back-to-back. Click on the green cleanMPG sig for more details.

I've been around 59-60mpgUS routinely in my A2 TDi 1.4, but that's an aluminium car with 3 cylinders (basically 3/4 of the 1.9TDi engine).

Basically:

Make sure you live somewhere with gently rolling hills so you can do P&G (but no big hills)
Temperate climate, 20 centigrade or more, but not in the 30s. Not less than 15c.
Never ever use your heater or climate control
Never drive in the rain
Never drive when there is a headwind
Never drive in the dark
Turn off all unnecessary electrical loads
Turn off your CD / radio, and LISTEN to your engine
Never put on a roof rack etc
Never drive less than 20 miles (and 30+ is better)
Never drive more than 60mph, preferably not over 55
Never drive in the city (stop/go)
Never drive in bad traffic (traffic jams)
Leave lots of space between you and the driver in front
Park facing down a hill (never start up a hill)
Park face-out (so you don't need to manoeuvre when your engine is cold)
Never drive an automatic
Never have passengers, empty out all unnecessary weight
Pump up tyres hard (40psi, or more)
Use LRR tyres

OK, some of the above is impractical if you live in a city etc. But a bad traffic day, or bad weather, will ruin a 60mpg tank. If you drive short distances, in the city, or too fast, you will never get a good tank. The 60mpg tanks I had were all in near-perfect conditions. I have no patience for the endless stream of people who complain about their MPG, when it turns out they drive at 80+mph.

Measure tanks brim to brim. Take a note of the miles at the 3/4, 1/2, 1/4, and reserve points. Use a trip computer which shows both instantaneous MPG and trip MPG, and compare your progress every day. After a while you will be able to tell the wind speed and direction simply by your MPG at particular points in your journey.


The car & mods don't matter as much as people think, as long as a) it's got a TDi, b) it doesn't have a DPF, c) it's manual, and finally d) it's aerodynamic (i.e., not the beetle, sorry guys). Mods will give you a few % extra, but changing the driver's right foot makes vastly more difference.
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Last edited by MikeMars; April 20th, 2011 at 12:56.
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Old April 20th, 2011, 13:56   #14
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The Beetle can be modded to be as aerodynamic as the rest of the fleet.
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Old April 21st, 2011, 08:49   #15
shizzler
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My best is 55/56 mpg back to back on a road trip to Florida and back (from Michigan).

No techniques whatsoever, just 70-75 mph cruising. Girlfriend did half the driving, and she damn sure didn't care about mpg.

My secret? - aeromods! (plus the usual, coasting when possible, and 40 psi in the tires). Now that I am lifted and 4" higher off the ground, mpg is suffering... along with some other new gremlins.....#$%& !

But seriously - lower your ALH TDI golf of Jetta, aeromod the crap out of it, maybe a lower 5th gear ratio, 40+ psi on LRR tires, and drive 60 mph steady state for full tanks. You will hit 60 mpg easily.
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