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Urba Centurion Update - (Kubota diesel, 100+ MPG in mixed driving - Fall 2012 on) Changzuki describes the progress of this diesel-powered custom car, with Triumph Spitfire manual transmission and rear differential. Top speed from the 850 cc Kubota is 65 mph, and it's returning 100+ MPG in mixed driving. By changzuki - 694 replies In forum: EcoModding Central

SuperGeek Pictures, what do you all think? Check out this cool custom motorcycle reverse trike project. Hes getting over 70 mpg! By Alien Vehicles - 60 replies In forum: EcoModding Central

My 1991 Talon TSi Compound Turbo AWD It would almost be easier to list what hasn't been done engine wise to this car. Suffice to say that he gets mid 40 mpg with an auto, and is pretty darn fast. Check out this extensive build here. By pgfpro - 432 replies In forum: EcoModding Central

Why no more lean burn?? If the Honda Insight, Civic VX and HX were so good at achieving high mileage with lean burn, why is it not in all current Hondas and other economy cars? This thread looks at reasons for its demise & possible return in new cars. By Mad Adder - 130 replies In forum: General Efficiency Discussion

Honda Insight Under-body Smoothing Panels (custom belly pan / undertray) This is an incredibly detailed effort to smooth out the underside of a first generation Honda Insight. After the modification, the owner says, "As for MPG, I seem to be getting about 7 MPG more than before. Average is about 81 MPG with 60 F temps, and this is over a full tank of gas." By 3-Wheeler - 81 replies In forum: Aerodynamics

15 mods = 15% MPG improvement: A-B test, 2007 Honda Civic 1.8L, 5-speed A collection of mosty small & inexpensive mods, from aerodynamic to electrical to gearing changes (through oversize tires) result in an average 15% mileage improvement in a 2007 Civic. By MetroMPG - 47 replies In forum: EcoModding Central

Dam, It works! (Air dam on Smart Fortwo: 3-4% MPG improvement) In addition to a clear lower grille block and smooth, black wheel covers, Chumly added and tested a simple air dam: "I just made an air dam out of some lawn edging. A-B-A testing shows 3.16% - 4.2% (avg 3.73%) better mileage. It took a whole half hour to make and install it, I should have done this a long time ago!" By chumly - 50 replies In forum: Success Stories

208 km (129 mi.) in EV mode with a 2007 prius plugin 20kWh Planetaire shares his very nice 2nd gen Prius PHEV conversion. By planetaire - 33 replies In forum: Hybrids

1997 Civic CX to HX engine/VX trans swap! 63 MPG @ 62 MPH When his 1997 Civic CX engine needed a lot of work, turbovr41991 decided to spend his repair time doing something different: he picked up a rusty Civic HX and swapped over the more efficient lean burn engine instead, and went with the more efficient gearing of the Civic VX. With a few other modifications in place, the car is returning seriously impressive highway fuel economy. By turbovr41991 - 187 replies In forum: EcoModding Central

2005 Prius engine into 1986 MR2: mk1 1nzfxe Prius swap (gas only) Mr220v informs us that used Prius engines are dirt cheap, and therefore fun to experiment with! He swapped one into an MR2, and using the Prius variable cam timing/Atkinson design, he now has variable compression on demand, via a push-button. He's still working out tuning, but fuel economy has gone up a healthy amount, from ~30 to 37 mpg (US). By mr220v - 114 replies In forum: Success Stories

Full-boat-tail trailer with gap-fillers for Toyota T-100 pickup Phil says: "The boat hull is far from ideal but using it will save hundreds of man-hours. Maybe 40 mpg HWY... we'll see. P.S. the trailer is large enough to serve as a rigid tent, for car-camping." By aerohead - 357 replies In forum: Aerodynamics

Heating the transmission with engine coolant A good brainstorming discussion about methods for speeding up the warming of the transmission's gear oil. By Daox - 127 replies In forum: EcoModding Central

Staying cool with out air conditioning Oil pan 4 builds a liquid cooled seat to stay cool without air conditioning. By oil pan 4 - 71 replies In forum: EcoModding Central

Old square sedan kammback Joris documents the construction and testing of a nicely made aluminum-skinned Kammback on his (very squared off) notchback Euro Volvo sedan. The addition is cleverly attached at the drip rails and hinged to preserve access to the factory trunk/boot. By Joris - 74 replies In forum: Aerodynamics

02 G1 Insight with many ecomods- 999.6 mile tank @ 105 MPG The donkey CRX has another epic build, this time with his 1st generation Honda Insight. By The donkey CRX - 133 replies In forum: EcoModding Central

Finally broke 60 mpg (bone stock '95 Honda Civic VX) New member Bugzilla scored a dealer-maintained, bone stock Civic VX and through driving technique alone surpassed 60 mpg (US) on his 4th tank. Next up: vehicle mods! By Bugzilla - 12 replies In forum: Success Stories

Ecoscort - 98 Ford Escort ZX2 ecomodding thread BabyDiesel's build thread for his 98 Escort. Hes currently averaging just over 50 mpg with an automatic transmission. By BabyDiesel - 422 replies In forum: EcoModding Central

David's 2001 Civic EV (80-100 mile range; 65+ MPH; 8 second 0-60) TheSGC swaps the guts from his 1996 lead-acid Honda Civic EV into a 2001 Civic body with lithium batteries and a few other updates. In the end, he'll have a DIY electric car with better performance than a Nissan Leaf. By TheSGC - 343 replies In forum: Fossil Fuel Free

Third Conversion, ultra efficient (1993 Geo Metro EV) EVmetro shares a wonderful thread on restoring and converting his 1993 Geo Metro to an electric vehicle. By EVmetro - 80 replies In forum: Fossil Fuel Free

Slow progress but progress (DIY two seater tadpole trike, 9hp Honda diesel) Old Mechanic is developing an efficient, aerodynamic platform for a tadpole vehicle with the flexibility to run various drivetrains, including (ultimately) his patented hydraulic hybrid drive system. Initial plans are to power it with a single cylinder Honda diesel mated to a Harley 5 speed. By user removed - 393 replies In forum: EcoModding Central