Thinking about taking my Vette ('66 but doesn't the HAMB have a "like body" clause?) on a trip. 454 with lumpy cam and 850 DP Holley, TH400 and 3:08s. Last I checked it got about 9mpg. Anyone think mileage would improve noticeably if I plopped a spread bore Holley or Q-jet on it and kept my right foot under control? I saw some published figures for a 454 Impala at 8-10 mpg, maybe that's the best one could expect.