300MPG.org is a web page and blog dedicated to people who take positive action to improve their own transportation options. From electric vehicles charged from the sun to just making sure you have the right amount of air in your tires, we can all make a difference to create a a better future, while still gettin’ around.

The site is administered by Ben Nelson, a self-professed tinkerer, who once almost accidentally built a motorcycle that gets the equivalent of over 300 miles per gallon.

If you have a great project that shows off what the common man (or woman) can do for a cleaner, more sustainable transportation future, let us know, and help share the story.

{ 19 comments… read them below or add one }

1 admin October 17, 2019 at 8:36 am

Hi Tom,
It is possible to build a budget-based Electric Vehicle, but there’s usually a pretty steep learning curve, and you want to make sure you have reasonable expectations up front.
Please read my article on what it takes to get started, which also includes links to the Build Your Own Electric Car video series, and other resources to get you started.

2 admin October 17, 2019 at 8:38 am

Hello Andre!
What you most likely want to do is just to switch out the chargers for some more typical single-phase chargers.
I know that some of the other versions of the Smith trucks used single-phase and had J1772 inputs on them. Seth, at Muller Industries had at least two trucks like that, but some of the parts, including the single phase chargers, had already been stripped off.
There are a lot of different chargers out there, and I’m sure you could find one compatible that runs on single phase.

3 Timothy Work November 17, 2019 at 6:26 pm

Hi Ben
I just want thank you for sharing your projects and advice, I really enjoy them. I hope to build my own electric vehicle. Thanks Tim in Ohio

4 Ben Nelson November 17, 2019 at 7:13 pm

Hi Tim!
Glad you like them. Thanks for the kind words.

5 Saket J November 24, 2019 at 9:21 am

Why can’t I see what I post here ?!

6 Saket J November 24, 2019 at 9:23 am

How can I see the comments I post here ?
Where can I ask the questions or doubts or give feedback ?!

7 admin November 24, 2019 at 1:14 pm

You can’t see it until after I approve the post. People often leave personal information here, so I make sure it isn’t publicly viewable right away.

8 admin November 24, 2019 at 1:15 pm

Right here is a fine place to ask questions.

9 Paul November 25, 2019 at 7:17 am

Hi Ben.
I can’t believe my luck that I have found your website and associated videos. As I’m gathering a list of parts needed for this project, I visited the Lovejoy shaft connector website. Other than the many shaft diameter options, they have quite a range in torque options. How did you calculate yours? Did you add a certain safety factor? What value did you end up with?
Thank you so much.

10 Frank Tucker November 26, 2019 at 10:00 am

Hello Ben,
First …. I LOVE all your videos.
Second … I need your advice.
Is this solar generator and panels a good buy?
I’m looking for something to power my natural gas fired furnace and blower in the event of a blackout this winter. I was thinking of getting the unit and 2 panels for this purpose and camping out.




Sorry to bother you, but it seems like it might be a good deal not to pass up.

11 Ben N November 26, 2019 at 10:27 am

Hi Frank, with just a quick review of the product, it looks fine. It’s basically a 100AH battery, an inverter, and a wall charger.
That should be fine for powering the blower on your natural gas furnace.
One thing to keep in mind is how long it can take to recharge the battery with solar.
That folding solar panel is only rated for 3.23 peak amps of current. A dead battery could take 30 hours of direct sunlight to recharge. In the winter (because you mentioned the furnace…) that could be an issue. In my area, we have very short days and the winter is the cloudiest time of year. In that case, you need enough solar power for the WORST CASE SCENARIO.

Sounds like a great product for camping and occasional brief power outages. If you are worried about a longer power outage, and blackouts in the winter, you may want to double up the solar panels or just buy a much larger one. Just depends on how much money you want to spend vs “how prepared” you are.


12 admin November 26, 2019 at 10:29 am

Truth be told, I didn’t calculate torque at all for the Lovejoy coupler for the Geo Metro. The parts looked sturdy, and I didn’t expect any issues.
The trouble that I did have came from the fact that one half of my couple was an off-brand foreign-make part, clearly of lesser quality metal. I also originally had a bit of a mis-alignment, which I should have corrected first, but I had already put so much work into the car and was just excited to have it on the road.

13 Saket J November 27, 2019 at 10:19 am

Hello Ben !
Once again Congratulations on your Geometro project !
What I want to ask is about your transmission in Geometro.
Is it really fine to run the transmission without oil ?
Is it safe ? Is it advisable to use pre existing transmission in motorcycle ? Because there will be problems running the transmission without oil & with oil, it will spill out of the casing if not sealed properly.
Also is it safe to shift gears in an oil-less fast rotating transmission ?
Upto what speeds is it safe to shift gears like this after all ??
Also what was the power torque (& peak torque) & max rpm of the motor of that forklift ? Any idea ?
If you could answer all of these questions, it will be like a boon to me…..
Especially about the transmission…..
God bless you for what you are doing for us all !
I’m watching your YouTube series as per your suggestion.
Thanks for a prompt response !

14 Saket J December 1, 2019 at 2:49 pm

Why is my question not being answered ?

15 admin December 1, 2019 at 6:04 pm

No. You want oil in your transmission.

It is not safe to run it without it, as it wasn’t designed for that, and friction will wreck the transmission.

Very few EV motorcycles have transmission. It’s easiest to simply NOT use one. Just use and electric motor with some gear reduction to the drive wheel.

I had no specs at all on the forklift motor which I used in the Geo Metro. It was a completely unmarked motor. It was a 10.5 inch diameter series wound motor pulled from a Nissan forklift. I have no specific info on that motor otherwise.

16 admin December 1, 2019 at 6:05 pm

Really long questions.
Ask specifics. Be clear.

17 Blair Fraser December 4, 2019 at 11:33 pm

Hi Ben. I’m making a plug in prius at the moment and I’ve got all of the electronics sorted and would love to show you some pictures of the progress so far. Do you have instagram?
Regards Blair Fraser
Kyneton Victoria Australia

18 BenN December 5, 2019 at 7:29 am

Hi Blair,

I don’t use instagram, but would love to see some photos. I sent you an e-mail. If you could send some photos, or a link to those photos, by that e-mail, that would be great!

19 John December 18, 2019 at 9:17 am

Hi Tim
In that there is no BMS how do you protect the Valence batteries from low temperature cut off?

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