i have the jettech split tank 90 oz fuel 35oz smoke oil. no lie on a conservative flight i can fly 11 minutes no problem. i always set my timer for 8 minutes and still have plenty of fuel left at the end. the 70 is very good on fuel and is the most quiet turbine. now on the other hand in my elan with the 125 0z tank p80 se you can fly as long as want to look up...take care ..pat