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Speed vs. MPG charts (post 'em if you got 'em) The speed at which you choose to drive has the biggest impact on your highway fuel consumption. This fact is nicely demonstrated by this collection of graphs showing the relationship of MPH to MPG in a variety of vehicles, from a 55 hp Geo Metro to a 505 hp Corvette, and many others in between. By bluejoey - 181 replies In forum: Hypermiling / EcoDriver's Ed

A better alternator delete By Daox - 140 replies In forum: EcoModding Central

Review: driving a $9998 2015 Nissan Micra (Nissan's most efficient manual in Can/US.) MetroMPG gets a Nissan Micra to review for a week. By MetroMPG - 84 replies In forum: General Efficiency Discussion

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

Commercially produced aerodynamic pickup bed cap Brett Herndon is a genuine craftsman who has combined his skill in clay modeling with his knowledge of aerodynamics to produce a professional quality aerodynamic truck cap which will literally pay for itself in gas savings. It's unlike anything you've seen before: it can be used as a big hatchback, transformed into a conventional box cap, or have its top removed to make room for oversize loads. Brett is taking his handiwork into commercial production, and is a success story waiting to happen. By MetroMPG - 545 replies In forum: Aerodynamics

Boat tail project based on a single wheel trailer... BamZipPow's epic customization & refinement of a single-wheel, drag-reducing trailer used on his already extensively aero-modified 1998 Toyota T-100 pickup. "Mileage is averaging around 27mpg with the trailer," he says, which he estimates is about a 2 MPG improvement. By BamZipPow - 1081 replies In forum: Aerodynamics

1st Gen Toyota Tundra Aeroshell Build Macskyver chronicles the building of his beautiful wooden aeroshell for his Toyota Tundra. By Macskyver - 197 replies In forum: Aerodynamics

1946 Chevy Prius Truck Watch how member Hoopie is integrating a 2001 Prius platform & drivetrain into a 1946 Chevy Truck, with the goal of making the changes invisible to the casual observer. By Hoopie - 283 replies In forum: Hybrids

Aero RV (custom boat tail for '95 Ford E-350 Class C motorhome) Orbywan says: "About a month ago I decided to build a boat tail for my 95 E-350 Ford 25 foot turbo diesel Class C motor home. I read the aerodynamics study NASA did at Dryden Air Force base back in the late 60’s on the squared off E-150 van about 20 times, as well as several other studies, drew up some plans and three weeks later and some serious sweat the prototype is done and tested." Initial results show about a 20% mpg improvement. By orbywan - 185 replies In forum: Aerodynamics

Drag reduction modifications in wind tunnel: Audi A2 from Cd 0.288 to 0.204 By Vekke - 53 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

CarBEN EV5 Full Sized Prototype Construction - 5 Seat Electric Car From Scratch NeilBlanchard has begun the construction process to build the full-sized prototype of his aerodynamic 5-passenger electric car he's nicknamed "CarBEN EV5". The prototype is being assembled with rigid foam sheets cut on a CNC machine. By NeilBlanchard - 732 replies In forum: DIY / How-to

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

t vago's MPGuino workspace thread, continued Check out t vago's continuous enhancement of the multi-featured MPGuino fuel economy computer / gauge. By t vago - 166 replies In forum: OpenGauge / MPGuino FE computer

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

"Short-shifting" a Jeep Patriot & Audi A4 CVT (forcing early "upshift") saves gas Does your car's automatic transmission have flappy paddles? What about a manual shift gate or shift buttons on the steering wheel? If so, you may be able to save fuel by wresting control from the computer over your upshifts. MetroMPG shares his experience in a Jeep and an Audi. By MetroMPG - 16 replies In forum: Hypermiling / EcoDriver's Ed