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Owner: lux lucid
1998 VW Jetta TDI: 1998 VW Jetta TDI
Displacement: 1.9 L
Fuel type: biofuel
Transmission: manual
Curb weight: 2679 lbs
Coefficient of drag: 0.32
Frontal area: 21.7 sq.ft.
Instrumentation: factory installed
Description: 1998 VW Jetta TDI sedan with 5-speed manual. It's the "A3" (aka "Mk III") platform with the standard rotary pump AHU engine (1.9L, 90HP).

Current Setup:
Stock everything, including instrumentation (speedo seems 3mph fast at 60mph vs my GPS).
29K miles on it when I bought it in 2003 (previous owner didn't drive much).
75K miles on it as of 2008.
As of Fall 2008, I'm driving this car 100% of the time (wife got her own '03 Jetta TDI wagon).
Using biodiesel since about 2003 (50K+ mi so far -- B99 in summer and B50 in winter).

Aero specs for '93 to '99 per http://ecomodder.com/wiki/index.php/Vehicle_Coefficient_of_Drag_List
Cd: 0.30 Cd
Height: 56.1
Width: 66.7
Frontal Area: 21.31 (per VW)
CdA: 6.39

Aero specs per http://www.mayfco.com/volks.htm
for a similar body style '94 Jetta III GL:
Cd: 0.320 (also per via cars.com)
Area (m2): 2.016
Area (ft2): 21.70
Cd x m2: 0.65
Cd x ft: 26.94
CdA: 6.94 ft2 / 0.65 m2

See my car's estimated spec on ecomodder.com's "Aerodynamic & rolling resistance, power & MPG calculator". Pretty darn accurate estimator!: http://tinyurl.com/mqfxbx
Build Thread:
Current Mods: 2003:
-- B99 biodiesel (99.9% in summer),
-- B50 in winter (November to March).
-- 100% synthetic engine oil.
-- Maxed tire pressure (to 44psi spec on sidewall).
2005:
-- "Nut behind the wheel." (started reading ecomodder)
-- Cursing if I have to use the brakes. (it helps)
-- Some pulse-n-glide (but no engine-OFF-coasting).
2009:
-- Front wheel alignment (fixed my uneven front-tire wear).
2010:
-- Engine over-run (a.k.a. coasting in gear = zero fuel consumed in TDIs)
-- Removed after-market roofrack bars (stored in trunk).
-- Antenna delete (Easily unscrews. Radio still works fine in town).
-- Partial grill block (Only about 10% -- top two grill slots).

Planned Mods: Anybody got a ScanGauge I could borrow near Portland, OR?
LRR tires
More grill blocking
Underbelly aero
Reshape chin airdam(?) or wheel spats
Kamm-back behind rear window or trunk
Official Fuel Economy Ratings
EPA city 33 mpg(US)
EPA highway 41 mpg(US)
EPA combined 37 mpg(US)

Actual Fuel Economy Performance
Lifetime 39.83 mpg(US)
Last 3 tanks 47.58 mpg(US)
90 days 48.97 mpg(US)
View Fuel Log
Last updated: Jun 21, 2010

(Created: 2008-07-02 18:45:17 / Modified: 2010-06-21 13:08:05)


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