75+ mpg (Want to get Geo Metro to this goal)

[Georgboy]

I would like a few more suggestions on what you guys think I should do next to achieve better mpg. I am planning on running an XFI cam shortly and fabbing up a 4 inch airdam up front to help with drag. What do you guys think?Thanks!!!

[Krayzie]

i see you have fender skirts...how much do they cover? and what about smooth wheel covers?

[JasonG]

Wow, hypermiling in ATL traffic.
And ITP at that !

[Georgboy]

Haha no Jason lol it's actual small town about 6o miles east of Atl on I-20... I could do it though... Gotta be a way . Maybe stop get out and push bahahaha!!

[Georgboy]

At Krayzie I will try to get pics up soon.

[Georgboy]

Well took a trip from up around Atlanta,Ga. Sat morning, down to Gainesville,FL. 315 miles got off an exit early so ended up being around 330 miles... Made it on close to 5 gal keeping an average speed of 50-55 mph on I-75 south. In the way back Sunday afternoon I tried this draft a 18 wheeler theory... Yeah got fussed at by one other driver about following to close to the truck in front of me (I have a cb radio) but I mean come on I am in the interstate in a soda can with a gasoline engine Bahahaha it's dangerous either way... My point is I went around 62-65 mph right behind this 18 wheeler and he had the side skirts and was going a bit slower than everyone else so I figured why not... I followed for about 70-80 miles. It started getting dark so I figured to back off due to lack if visibility caused by the dark. I filled up in Macon,Ga. and in the tank I got 62.04 mpg. I believe that in my car that I would see a better gain going slower and not drafting on the interstate.... As long as I am not over 20mph under the posted speed. Something told me to check under the hood after we stopped for dinner and I noticed what looked like to be oil under the hood on the front sidebar the engine.. After further investigating the mysterious fluid I realized that it was antifreeze. I started searching for the cause and I noticed it dripping out of the water pump seep hole. So luckily my folks had driven down separately and they had eaten dinner with us so I took the car across the street to a secure location (walmart parking lot) with cameras and rode with them to the house to get the truck and return the car to the house... I just got the new water pump installed last night and am at a good point to install the XFI camshaft, but I am unsure about it because people are saying that they are only seeing 2-3 mpg gains from it and that the cam will fall on it's face at 4k + rpms. I know that I should not see 4k rpms , but this cam will only save me around $100 a year and I was told this cam would bet me around 8-12 mpg improvement, and the guy at the regrind shop told me I should see around 15-20 mpg improvement based on what I was getting with the "stock" cam. I know better atleast I think I do about the 15-20 improvement. I would like to know if you guys with the XFI cam swap would do it again if they had the option . Just uncertain I want to install this cam.. Suggestions??? Thanks guys sorry for the long post...

[Sven7]

I've never done a cam swap but it seems like 2-3mpg a year would be worth it. Have you installed an alternator delete switch? That's supposed to save up to 10%.

[Georgboy]

How do you do the alternator switch? I read that doing the alternator delete was the 10 % increase....I wonder how much it will increase with this switch to turn it off.... Hmm is there a thread handy??

[Sven7]

This has a how-to (you have to take the alt apart): Alternator Disable Switch - EcoModder

However I was told you could just wire a switch in line with the power cable. Why wouldn't that worK?

[some_other_dave]

You're still turning the alternator, just against less resistance. The 10% gain, AFAIK, was from removing the alternator and its drive belt completely. Switching off the field windings in the alt was a much smaller gain I believe.

-soD