Well a fine tuned motor can work on pump gas (I'd still use racing gas) On a 11 - 11.5 use can mix it to keep costs down but what a difference in performance. I used to motors and convinced all my customers to mix their fuel and today with levels of alcohol in the fuel unknown I would highly recommend it. Just how many miles a year do the average people drive these cars. Not much. When you add 2 gal. race gas to a 15 gal tank you put in 13 gal of pump gas plus 2 gal race gas add total $$ divide by 15 and that's your cost. Here Premium pump gas is 4.00 x 13 = 52.00 race fuel is 12.00 in the can x 2 = 24.00 total $76.00 / 15 = $5.07 a buck more. If you use reg. at 3.39 the price is only $4.60 and 2 gals. of leaded 110 makes a big difference in unleaded fuel.
