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Another truck aero cap idea... Follow the evolution of BamZipPow's aerodynamic cap for his 1998 Toyota T-100 pickup. By BamZipPow - 392 replies In forum: Aerodynamics

Experiment: coast down distances (rolling resistance) @ various tire pressures Increased air pressure reduces a tire's rolling resistance - but is more pressure always better? Coast-down distances are measured for three different kinds of tires, with pressures ranging from 20 through 70 psi. By MetroMPG - 116 replies In forum: EcoModding Central

Have you ever given 1-on-1 ecodriving instruction? (Here's how I did it.) MetroMPG walks us through his recent experience of teaching individual "non-hypermilers" about ecodriving. With just an hour-long session, each driver's results showed an immediate increase in fuel economy above their car's EPA ratings. By MetroMPG - 112 replies In forum: Hypermiling / EcoDriver's Ed

The AX Eco Project : 100 mpg target ! In the 90's, the super light Citroën AX diesel held a Guinness record as the most efficient production car available, capable of 65 mpg (US) at 56 mph (90 km/h). HypermilerAX's modifications have already improved this to 80 mpg (US) at 56 mph. Now he's aiming for 90 mpg to beat the 1994 "AX Eco" concept car, and is also eyeing a 100 mpg tank (2000 km). By HypermilerAX - 131 replies In forum: EcoModding Central

Taller Tire Test (5.7% MPG increase observed on Honda CR-Z @ 55-65 MPH) The purpose of the test was to determine whether larger diameter tires, which result in lower engine RPM and higher load for a given speed, can improve gas mileage. The test car has a 6-speed manual transmission. At highway speeds (55-65 MPH), the larger tires gave a 5.7% average increase in MPG. The engine ran about 200 RPM lower. By SecondWind - 72 replies In forum: EcoModding Central

Lean burn Honda Civic sedan: 93 Civic d15z1 swap into LX 4 door (VLX) 4-door efficiency: slownugly is buttoning up this project where he took the lean burn engine from the iconic Civic VX and swapped it into a sedan body. "Goals: 50 MPG average while maintaining stock appearance. It will be the economy sedan Honda never made in this generation." By slownugly - 182 replies In forum: EcoModding Central

Automatically actuated grill block - Mk3 Daox designs an automatically actuated grill shutter. The design is nearly fully 3d printed and controlled via an arduino. By Daox - 139 replies In forum: Aerodynamics

Tall tire test (taller gearing advantage offset by wider, heavier wheels/tires?) Taller tires mean reduced cruising RPM, which is good for fuel economy. But what if the taller wheels/tires are also wider (which increases aero drag) and heavier? SentraSE-R tested his Scion Xb to find the answer. By SentraSE-R - 97 replies In forum: EcoModding Central

Project 100 (custom enclosed Honda C90 targets 100 mph vmax and 100 km/L FE) Forum member visionary is custom-building an enclosed motorcycle with the goal of achieving 100+ mpg at its cruising speed of 70 mph, from an engine displacement of 100 cc. By visionary - 385 replies In forum: Motorcycles / Scooters

PICS! Econo Car conversion to Kubota Diesel. 1997 Geo Metro, Kubota D1005 3 cylinder Planejob is making great progress on dieselizing his Metro. His goal: "I want something that seats 3, sounds like a tractor, gets great mileage, and looks insane (aero mods)." No doubt that's going to happen. By planejob - 238 replies In forum: EcoModding Central

How to Winterize Your Car EcoModder Style Check out our list of things to do to winterize your car. Add your own info and thoughts too! By Daox - 45 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

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

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