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neighborhood going to the tails (spotted a 2nd gen. Prius with a boattail on my road) Another boat tail project - this one is notable for its cost (about $100) and clever mounting arrangement. And it shows yet again that a proper design on the rear of a 2nd generation Toyota Prius can return a 10-12% improvement in fuel economy at highway speeds. By Weather Spotter - 37 replies In forum: Aerodynamics

Under two liters for the first time (That's 121.07 mpg US @ 54 mph avg. speed) Vekke has accomplished the significant goal of beating 2L/100 km on the open road. Fill up showed 1.94 L/100km @ 86.9 km/h average speed. That is 121.07 mpg (US) at 54 MPH avg speed. By Vekke - 34 replies In forum: Success Stories

Getting the most out of lean burn (Honda) Honda engines with lean burn capability can return seriously impressive cruising fuel economy numbers. Greasemonkee has been modding his Civic VX to expand the lean burn "window" and now he's getting lean burn earlier & more often under a wider variety of conditions. By greasemonkee - 54 replies In forum: EcoModding Central

Golf cart based electric motorcycle build. The Goal: Build an electric motorcycle that can reach 60-65mph for under $1,500. By Ryland - 104 replies In forum: Fossil Fuel Free

Prius 15's are better than aftermarket 17's! (Wrong wheels/tires can wreck your MPG) They may look nice, but... Prius owner Wyatt was shocked to discover how much worse his fuel economy was with aftermarket wheels and tires, compared to the factory ones. Both sets had practically the same circumference, so he attributes the MPG penalty to increased aero drag and rolling resistance. By wyatt - 107 replies In forum: Success Stories

MG Midget + Geo Metro 3cyl = MGeo This ambitious fabrication project starts with a '71 MG Midget receiving a Suzuki 1.0L G10 engine (from a Geo Metro). Additional mechanical and aerodynamic mods follow, including a focus on weight reduction. The Midget is a very small and light car - stock is only 1500lbs. The goal is to get weight to ~1200 lbs and aim for super high MPG. By nimblemotors - 250 replies In forum: EcoModding Central

15 more PSI = 7% better MPG Cbaber is happy with the results of going from 30 to 45 PSI: "This tank was the first with the tires pumped up to 45 PSI. I originally had them at 30 PSI. The only thing that changed was the tire pressure, and I managed 45 MPG instead of the usual 41-42 MPG. That's about 3 MPG, or 7%." By cbaber - 125 replies In forum: Success Stories

500 mile tank, 1996 Accord 5-spd (= 38 mpg US, vs. 25 mpg EPA) After retiring his Civic, Bruce illustrates how a manual transmission gives a motivated eco-driver a lot more options for improving economy. He beats the EPA combined rating by over 50% on his first tank of fuel in an unmodified stick shift Accord. Add modifications on top of that, and watch the numbers climb further! By brucepick - 8 replies In forum: Success Stories

Electric Clutch Power Steering 4ringcircus describes the project: "I have added an electric clutch to the hydraulic power steering and now can switch it on and off with the push of a button! My truck is a '97 Ford Ranger extended cab, 4x4 with the 4.0 OHV engine and manual 5 speed transmission." The results? 1 - 1.5 more MPG. By 4ringcircus - 63 replies In forum: DIY / How-to

>50 mpg w/ 3/4-ton pickup Diesel Dave describes the driving techniques plus vehicle mods that allowed him to break the 50 mpg mark (on the admittedly optimistic factory-installed MPG gauge) in his 2007 Ram 2500 Quad Cab. He adds, "A year ago I never thought this would have been possible. A year ago I was excited when I got over 30 mpg for the first time." By Diesel_Dave - 75 replies In forum: Success Stories

MetroMPG's Honda Insight boat tail extension (cardboard) tuft video; ABA test +9.7% MetroMPG used CAD (Cardboard Aided Design) to make a 'temporary' aero tail for his Insight. The project thread includes a video of tuft testing the completed tail, and an A-B-A test that showed a 9.7% improvement in fuel economy at 80 km/h (50 mph). At that speed, on a level road, the car can now achieve 110+ mpg (US). By MetroMPG - 226 replies In forum: Aerodynamics

Idea on Auto Adjusting Grill Block Shortie771 has designed an automated variable grill block that uses air pressure against a counterweight to actuate the shutters, rather than electronics or a manual cable actuated approach (two other common methods). By Shortie771 - 61 replies In forum: Aerodynamics

probably the coolest aero pizza pan steel wheel covers ever Who says Eco can't look sweet? Here's what one member did with a simple taped off paint pattern on a smooth wheel cover. By ElPants21 - 8 replies In forum: Aerodynamics

BMW e36 318 tds - modding thread Here's an interesting project: the award for worst drag coefficient in the e36 BMW 3-series range went to the 3-door hatchback. But AndrzejM likes the utility of the diesel BM hatch, so he's addressing the drag problem with the testing (see Kammback tuft testing video on YouTube) and construction of various other mods. By AndrzejM - 141 replies In forum: EcoModding Central

2013 Vetter Fuel Economy Challenges Motorcycle efficiency enthusiasts take note: Craig Vetter has posted events for May 3 in Carmel, California, followed by an invitational showing at Mike Corbin's Hollister Event, July 5. Next up is the Vetter Challenge at Ohio July 19. Finishing the year is the BIG ONE: Las Vegas to Barstow October 20. By cvetter - 2 replies In forum: Motorcycles / Scooters

Project: The AeroFocus EcoModders love boat tails because they know that the biggest opportunity to reduce aerodynamic drag is at the rear of most vehicles. This project shows the streamlining of a 2000 Ford Focus. By HydroJim - 259 replies In forum: Aerodynamics

Disabling intake and exhaust valves (going to 8 valves in a 16-v head) By Gasoline Fumes - 84 replies In forum: EcoModding Central

Chevrolet "de-modding" the Volt's aggressive front air dam on request Big air dams can reduce drag... but sometimes they're just a drag! It's exceedingly rare to see an automaker going "too far" with OEM efficiency strategies, but it appears some Volt owners aren't happy with the front of their cars scraping the ground onc By MetroMPG - 22 replies In forum: Aerodynamics

Streamlining the Civic (2005 Civic EX coupe) Vman455 describes the focus of the modifications to his Civic coupe: "Most of my driving is on the highway, with a 45-mile (one-way) commute three days a week through pancake-flat central Illinois, so I've been focusing on aerodynamic modifications for the open road." By Vman455 - 47 replies In forum: Aerodynamics

Four consecutive 100mpg+ fillups!!! (Yamaha SR185 streamlined motorcycle) bschloop has modified his Yamaha motorcycle to compete in a recent Vetter fuel economy run. He says, "I just filled up the bike today, my longest tank for mileage: 233 miles on 2.09 gallons. That comes to 111 mpg and caps a great week for fuel economy on my streamliner." Also see his build thread: 2012 Vetter Challenger Build (1981 Yamaha SR185 streamliner). By bschloop - 6 replies In forum: Success Stories