HMMMM interesting
 

the picture says it all
https://www.fuelly.com/attachments/fo...2bd1986a4f.jpg
Not sure how but today I may have set a personal record

So what did you do different?
Congrats man... Now Blow this record out of the water!

not a clue I guess the constant 12% TPS helped. hills suck at 12% but flats are nice.

This is not a personal record but it is the best I've ever done on winter mix

I'm keeping fairly consistent with my summer average too! I can't wait to see my numbers once spring comes around.

OK went out and ran my test loop again after removing the airdam extension and I now am at 40+mpg a new personal record WOOHOO!!!!!!!!!!!!!!

congrats! my best trip is ~49, and my car is much smaller.

I hope I can keep this up

hmmm removed the air dam? do you think that would help on all cars?

I wondered about that too. We generally accept that extending the air dam is a good thing, but maybe that's not universal. Maybe on some cars letting the air go under is better than plowing even more air up and over.

it seems that in my case the added frontal area caused more drag than it cured. I would use it as a case by case thing. It all depends on the car and it's particular underbody aerodynamics. Some cars once a full belly pan is installed no longer need an airdam.

Today my TANK average has crept past 37mpg I'm still baffled I mean I have my 5 spoke heavy 16" wheels with performance tires on the car the lower grille block is off and I'm still climbing. to quote Alice "This just gets curiouser and curiouser."

Better gas? Better driving conditions?

I don't think heavy wheels matter as much as other people think they do, but tires could. What sizes are we comparing?

the wheels are 16X7 and weigh in at 35# each Plus tire it runs close to 50# a corner the tires are 215/55r16 Pirelli P6 and they are nearing shot. I am trying to save up for new springs so I can raise the car back up a little and get the alignment closer to Zero camber.

Worn tires have much less rolling resistance. When I was researching RR, I learned that; it sounded like the worst bald tires would be better than the best new tires.

that's sad about the lower air dam... I like the looks of mine and I hope to some day make a belly pan. oh well It's all for better mpg and some $ in my pocket