Your best modification

[gasti_ako]

Hi guys, can you advise the best modification that you made to your car. When I say best it gave you a very "Significant" increase in MPG. and you have modified yourself as a driver already=)

Thanks guys.

[vtec-e]

I was going to say "slowing down" but i figured you wanted hardware so i'd say getting the tires up to sidewall, followed by a grille block, followed by a belly pan, lighter oil.

ollie

[BlackDeuceCoupe]

50 psi... and it's *free*!

Shed excess weight... that's *free* too!

[cfg83]

gasti_ako -

After changing how I drive (ScanGauge was part of that), my 5th gear swap :

http://ecomodder.com/forum/showthrea...swap-2779.html

CarloSW2

[gasti_ako]

the question arose when i tried to view each fuel logs and there seem to be different modifcations that affected MPG significantly. also, i created this thread because it would be a long shot to check each log.

for those that replied thank you. =)

anymore?

[bikin' Ed]

The "best" modification past pumping tires and driving style will vary with the vehicle. Large grilles should be blocked. Pick-ups need a bed cover. Bellypan is the answer for a vehicle with a lot of turbulence underneath. They will all add something to being more aero. Timing and WAI may be engine mods that will be the best for you. Find someone with a similar vehicle and see what they have done. It may also keep you from trying something that didn't work.

[modmonster]

my pasenger wing mirror and aerial delete was very impressivly successful. way more than the 2% that i was hoping for. i measured 17% initially but i think its more consistently like 8%, at least 5mpg (imperial). i have a small efficient petrol car that is otherwise well areo'ed.

[dcb]

Hmm, lots of things have worked on different cars.

Best one by in my experience was swapping out an auto trans for a manual one. Cost about $500 (parts car w/stick + misc) and a very long weekend, but took it from 25mpg to a 50mpg in-town hypermiler, with appropriate techniques.

Of course you can get similar results with an auto, I think Gerdes does, I just felt more confident with a bump start backup for my starter, especially when the starter starts turning over slow. And the accelerating won't have the converter slip with a clutch.

[i_am_socket]

Tires is definitely #1. After that the grill block, then mirror delete/swap. But like others have said, it depends on the vehicle and where you're driving. Areo mods don't mean as much when 80% of your driving is city, and weight reduction doesn't mean much when 80% of your driving is highway.

90% of my driving is highway so it's all aero for me. Next up is airdam and partial front undertray testing.

I'd love a manual tranny though...

[basjoos]

Boat tail. In addition to significantly increasing mpg's, it also doubled the luggage space available behind my back seat.