Ya I promise those numbers are legit. I get over 400 miles out of a tank. I try not to get down to 1/8th tank unless I am doing a fuel treatment so I am not sure the "exact" full tank to zero numbers. As far as the how, check my sig that is everything I have done. I don't always have all the ucp and rock rails on when I am mall crawling though so that saves prob close to 400 lbs in dead weight.
I also run 4.5 quarts 0w-20 redline full synthetic oil, 1 quart amsoil 5w-30 and a can of ceratec. Lighter oil resists less which means less fuel is needed to get pistons moving etc. Before we start a huge fight. I know 5w-30 is what GM recomends. I ran amsoil 5w-30 exclusively before but now I am convinced the redline is the way to go. There is an entire forum dedicated to oil on the net see there for oil arguments
A real legit tune helps too. The "canned" tunes from various people only get you close, they cant really take into effect your driving habits and terrain differences. For the guys that want real performance get hptuners and tune your self. It's not hard.
I opened a thread a while back when I was seriously looking for an alpha, I test drove a bunch and was underwhelmed in the power difference between what I have done to my I5 and a stock alpha. I could easily pull on a stock Alpha right now. That being said a modified alpha would be a different matter.
but....
If you are getting 12 mpg with an alpha I am going to consider getting an H2 now.
There is a sick SUT here that just went up for sale...
